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Although many lines of evidence indicate that birds evolved from groun

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Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post Updated on: 20 Aug 2019, 00:41
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Although many lines of evidence indicate that birds evolved from ground-dwelling theropod dinosaurs, some scientists remain unconvinced. They argue that theropods appeared too late to have given rise to birds, noting that Archaeopteryx lithographica—the oldest known bird—appears in the fossil record about 150 million years ago, whereas the fossil remains of various nonavian maniraptor theropods—the closest known relatives of birds—date only to about 115 million years ago. But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx. In any case, failure to find fossils of a predicted kind does not rule out their existence in an undiscovered deposit. Skeptics also argue that the fused clavicles (the "wishbone") of birds differ from the unfused clavicles of theropods. This objection was reasonable when only early theropod clavicles had been discovered, but fossilized theropod clavicles that look just like the wishbone of Archaeopteryx have now been unearthed. Finally, some scientists argue that the complex lungs of birds could not have evolved from theropod lungs, an assertion that cannot be supported or falsified at the moment, because no fossil lungs are preserved in the paleontological record.
1. The primary purpose of the passage is to

A. compare the development of two hypotheses concerning the evolutionary origin of birds
B. suggest revisions to the standard theory of the evolutionary history of birds
C. evaluate the usefulness of fossil evidence in determining the evolutionary history of birds
D. challenge the theory that birds evolved from ground-dwelling theropod dinosaurs
E. respond to criticisms of the theory that birds evolved from ground-dwelling theropod dinosaurs




2. In the context of the passage, the phrase "fossils of a predicted kind" most likely refers to which of the following?

A. Theropod fossils with fused clavicles
B. Theropod fossils that are similar in structure to Archaeopteryx fossils
C. Theropod fossils dating back more than 150 million years
D. Fossils indicating the structure of theropod lungs
E. Fossils indicating the structure of Archaeopteryx lungs



3. Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced that birds evolved from theropod dinosaurs?

A. There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx.
B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs' lungs.
C. Theropod dinosaurs appear in the fossil record about 150 million years ago.
D. Theropod dinosaurs did not have fused clavicles.
E. Theropod dinosaurs had certain bones that look just like those of Archaeopteryx.



Originally posted by Lucky2783 on 24 Mar 2015, 02:22.
Last edited by SajjadAhmad on 20 Aug 2019, 00:41, edited 2 times in total.
Updated - Complete topic (219).
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 10 May 2017, 15:16
10
2
Kritesh wrote:
Total time taken 8 mins

1.C
2.B
3.D

mikemcgarry - Could you please explain that for questions 1&2 why the answer is E & C .

Dear Kritesh,

I'm happy to respond. :-)

For #1, think about the flow of the entire passage. Pay close attention to the action of "direction words," words that serve to direct the flow of an argument, either by adding on and amplifying, or by creating a change in direction by a contrast word.

Although many lines of evidence indicate that birds evolved from ground-dwelling theropod dinosaurs, some scientists remain unconvinced.
Ambiguous opening sentence, typical of academic writing--the author has not yet shown his hand, what he believes.

They [the unconvinced scientists] argue that ....
so far, we don't know what the author really thinks . . .

BUT investigators have now uncovered
Ah ha! That word "but" is HUGE! This is a very classic argument format: "My opponent thinks X, BUT I think Y" This is a very effective strategy in argument, because the implication is that I know & understand my opponent's argument but I know better.

The next sentence "in any case," which is a way of adding on an additional point. This strengthens his response to the first objection.

Now, another round:
Skeptics also argue . . .
Again, the author is stating the opinions of those with whom he disagrees, more objections.

This objection was reasonable when . . . but . . .
Rhetorically very effective: he gives a partial concession to the opponents view--yes, it worked in the past, but it's nonsense to believe it now!

"Finally" = another strong summary word.

Throughout the whole passage, the author was stating the objections to the theory and then was arguing against those objections. He was defending the theory that "birds evolved from ground-dwelling theropod dinosaurs." Anything that states the meaning of the paragraph should capture this back-and-forth, objection and then response to objection, which happens a few times. The author is not simply evaluating, which implies a neutral agenda. The author has constructed sophisticated argumentative structures to respond to objections. Thus, the best answer to #1 is
(E) respond to criticisms of the theory that birds evolved from ground-dwelling theropod dinosaurs

For #2, look at that section of the text:
They [the unconvinced scientists] argue that theropods appeared too late to have given rise to birds, noting that Archaeopteryx lithographica—the oldest known bird—appears in the fossil record about 150 million years ago, whereas the fossil remains of various nonavian maniraptor theropods—the closest known relatives of birds—date only to about 115 million years ago.
This is objection #1: birds are old, 150M years old, and nonavian maniraptor theropods are not that old.

But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx.
First, specific response to objection #1

In any case, failure to find fossils of a predicted kind does not rule out their existence in an undiscovered deposit.
More general response to the objection.

Let's think about the author. The author is defending the theory that "birds evolved from ground-dwelling theropod dinosaurs." Obviously, what would strength his case the most is if scientist found definitive evidence of ground-dwelling theropod dinosaurs from the time of the first birds (150 MYA) or older. Short of that, he argues that the current absence of these are simply due to the fact that we haven't discovered them yet. The particular fossils that interest him are "ground-dwelling theropod" as old as birds (150 MYA) or older.

The best answer is
(C) Theropod fossils dating back more than 150 million years

Does all this make sense?
Mike :-)
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 10 Jun 2016, 08:59
Time Taken: 5 min 52 secs

1) The primary purpose of the passage is to

The passage is mainly concerned about the evolution of birds from theropod dinosaurs.

Answer: E

2) In the context of the passage, the phrase “fossils of a predicted kind” most likely refers to which of the following?

Refer: They argue that theropods appeared too late ................... maniraptors dating to the time of Archaeopteryx

Answer: C

3) Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced

Refer: "Skeptics also argue that the fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods"

Answer: D
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 18 Jun 2016, 21:20
Divyadisha wrote:
3:47

All correct :)

Please explain why 2. is not B.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 25 Nov 2016, 13:14
1
ShashankDave wrote:
Divyadisha wrote:
3:47

All correct :)

Please explain why 2. is not B.



There was an objection raised by the scientists that there was no record of fossil (theropods) found about 150 M years ago.
But since in new investigations fossils(theropods) were found that dated back 150 M years, the scientists claim was refuted.

On this note, author argues that "Even if there was no fossil found, which dated back 150M years, scientists cannot completely override any future possibility on finding one"

"fossils of a predicted kind" --> referring to the new evidence (theropods fossils dating back 150)
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 29 Nov 2016, 03:53
1
-The author presents a point of debate
- The author then points out the challenges presented by scientists on a certain topic
- The author then responds to the challenges presented by the scientists

Took 5 mins 40 seconds in total , including 2 mins to read

1. The author clearly states the criticisms of scientists and responds to each one of those criticisms. Hence option (E) is the best answer choice.

2. "noting that Archaeopteryx lithographica—the oldest known bird—appears in the fossil record about 150 million years ago, whereas the fossil remains of various nonavian maniraptor theropods—the closest known relatives of birds—date only to about 115 million years ago. But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx. In any case, failure to find fossils of a predicted kind does not rule out their existence in an undiscovered deposit."

The fossils dating back to 150 years ago are what are being referred to and hence option (C ) is the right answer.

3. "Skeptics also argue that the fused clavicles (the "wishbone") of birds differ from the unfused clavicles of theropods"

Answer D
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 29 Nov 2016, 12:42
1
Hi, I did not understand how come the ans of qstn 3 is D. will the sentence 'Skeptics also argue that the fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods' imply that 'Theropod dinosaurs did not have fused clavicles.'? It might also be possible that Theropod dinosaurs have both fused and unfused clavicles but here the comparison is drawn only with unfused clavicles for some reason.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 10 May 2017, 03:19
Total time taken 8 mins

1.C
2.B
3.D

mikemcgarry - Could you please explain that for questions 1&2 why the answer is E & C .
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 11 May 2017, 10:10
Hi mikemcgarry ,

Thanks a lot for the wonderful explanation . :)

Now i clearly understood the passage as well as the answers.

Warm regards,
Kritesh Singh
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 30 Jul 2017, 19:20
Hi mikemcgarry

Can you please explain question 3.I chose option B..I dont know why the answer is D.

Thanks



mikemcgarry wrote:
Kritesh wrote:
Total time taken 8 mins

1.C
2.B
3.D

mikemcgarry - Could you please explain that for questions 1&2 why the answer is E & C .

Dear Kritesh,

I'm happy to respond. :-)

For #1, think about the flow of the entire passage. Pay close attention to the action of "direction words," words that serve to direct the flow of an argument, either by adding on and amplifying, or by creating a change in direction by a contrast word.

Although many lines of evidence indicate that birds evolved from ground-dwelling theropod dinosaurs, some scientists remain unconvinced.
Ambiguous opening sentence, typical of academic writing--the author has not yet shown his hand, what he believes.

They [the unconvinced scientists] argue that ....
so far, we don't know what the author really thinks . . .

BUT investigators have now uncovered
Ah ha! That word "but" is HUGE! This is a very classic argument format: "My opponent thinks X, BUT I think Y" This is a very effective strategy in argument, because the implication is that I know & understand my opponent's argument but I know better.

The next sentence "in any case," which is a way of adding on an additional point. This strengthens his response to the first objection.

Now, another round:
Skeptics also argue . . .
Again, the author is stating the opinions of those with whom he disagrees, more objections.

This objection was reasonable when . . . but . . .
Rhetorically very effective: he gives a partial concession to the opponents view--yes, it worked in the past, but it's nonsense to believe it now!

"Finally" = another strong summary word.

Throughout the whole passage, the author was stating the objections to the theory and then was arguing against those objections. He was defending the theory that "birds evolved from ground-dwelling theropod dinosaurs." Anything that states the meaning of the paragraph should capture this back-and-forth, objection and then response to objection, which happens a few times. The author is not simply evaluating, which implies a neutral agenda. The author has constructed sophisticated argumentative structures to respond to objections. Thus, the best answer to #1 is
(E) respond to criticisms of the theory that birds evolved from ground-dwelling theropod dinosaurs

For #2, look at that section of the text:
They [the unconvinced scientists] argue that theropods appeared too late to have given rise to birds, noting that Archaeopteryx lithographica—the oldest known bird—appears in the fossil record about 150 million years ago, whereas the fossil remains of various nonavian maniraptor theropods—the closest known relatives of birds—date only to about 115 million years ago.
This is objection #1: birds are old, 150M years old, and nonavian maniraptor theropods are not that old.

But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx.
First, specific response to objection #1

In any case, failure to find fossils of a predicted kind does not rule out their existence in an undiscovered deposit.
More general response to the objection.

Let's think about the author. The author is defending the theory that "birds evolved from ground-dwelling theropod dinosaurs." Obviously, what would strength his case the most is if scientist found definitive evidence of ground-dwelling theropod dinosaurs from the time of the first birds (150 MYA) or older. Short of that, he argues that the current absence of these are simply due to the fact that we haven't discovered them yet. The particular fossils that interest him are "ground-dwelling theropod" as old as birds (150 MYA) or older.

The best answer is
(C) Theropod fossils dating back more than 150 million years

Does all this make sense?
Mike :-)

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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 31 Jul 2017, 10:53
gamerguy0074 wrote:
Hi mikemcgarry

Can you please explain question 3.I chose option B..I dont know why the answer is D.

Thanks

Dear gamerguy0074,

I'm happy to respond. :-)

Here's Q#3:
3. Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced that birds evolved from theropod dinosaurs?

A. There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx.
B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs' lungs.
C. Theropod dinosaurs appear in the fossil record about 150 million years ago.
D. Theropod dinosaurs did not have fused clavicles.
E. Theropod dinosaurs had certain bones that look just like those of Archaeopteryx.


Since you ask about (B) and (D), I'll just discuss those two.

B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs' lungs.
This is a very sophisticated trap answer. Here's the relevant part of the passage:
Finally, some scientists argue that the complex lungs of birds could not have evolved from theropod lungs, an assertion that cannot be supported or falsified at the moment, because no fossil lungs are preserved in the paleontological record.
These skeptic scientists do have an argument about lungs, but the fact that "no known theropod dinosaur fossils that indicate the structure of those dinosaurs' lungs" does not in any way constitute part of these skeptics' argument. Quite to the contrary, this is the reason that their argument can be neither supported nor falsified. This fact comments on the possible evaluation of their argument, not on the content of their argument. Does this distinction make sense?

D. Theropod dinosaurs did not have fused clavicles.
Very clear proof text:
Skeptics also argue that the fused clavicles (the "wishbone") of birds differ from the unfused clavicles of theropods.
This is, quite directly, something that the skeptics argue.

Does this make sense?
Mike :-)
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 11 Aug 2017, 09:37
Nightmare007 wrote:
6 min 2 seconds
My answers - 1- D (incorrect - why the answer is E not D ??)
2- C
3- D



Hi If you observe a particular pattern in this passage is, every time scientists raise concern or cite any evidence to argue that dino is not bird author provide another evidence or fact that smoothly counter scientist point. here 2 confronting parties are scientist and author... that indicate option E

And for D ..challenge is made by scientists to theory that dino is bird not by author so purpose of passage should be the purpose of Author.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 02 Nov 2017, 23:35
The only thing I don't understand about question 3 is that is says "skeptics" rather than "scientists." I narrowed down question 3 to B and D however I felt that skeptics could have referred to a different group of people? Or I suppose with question 3 it would be better to eliminate B because that statement is not necessarily supported by the passage? It doesn't say anywhere that scientists are challenging the lack of fossil lungs.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 02 Nov 2017, 23:41
Lucky2783 wrote:
Although many lines of evidence indicate that birds evolved from ground-dwelling theropod dinosaurs, some scientists remain unconvinced. They argue that theropods appeared too late to have given rise to birds, noting that Archaeopteryx lithographica—the oldest known bird—appears in the fossil record about 150 million years ago, whereas the fossil remains of various nonavian maniraptor theropods—the closest known relatives of birds—date only to about 115 million years ago. But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx. In any case, failure to find fossils of a predicted kind does not rule out their existence in an undiscovered deposit. Skeptics also argue that the fused clavicles (the "wishbone") of birds differ from the unfused clavicles of theropods. This objection was reasonable when only early theropod clavicles had been discovered, but fossilized theropod clavicles that look just like the wishbone of Archaeopteryx have now been unearthed. Finally, some scientists argue that the complex lungs of birds could not have evolved from theropod lungs, an assertion that cannot be supported or falsified at the moment, because no fossil lungs are preserved in the paleontological record.
1. The primary purpose of the passage is to

A. compare the development of two hypotheses concerning the evolutionary origin of birds
B. suggest revisions to the standard theory of the evolutionary history of birds
C. evaluate the usefulness of fossil evidence in determining the evolutionary history of birds
D. challenge the theory that birds evolved from ground-dwelling theropod dinosaurs
E. respond to criticisms of the theory that birds evolved from ground-dwelling theropod dinosaurs




2. In the context of the passage, the phrase "fossils of a predicted kind" most likely refers to which of the following?

A. Theropod fossils with fused clavicles
B. Theropod fossils that are similar in structure to Archaeopteryx fossils
C. Theropod fossils dating back more than 150 million years
D. Fossils indicating the structure of theropod lungs
E. Fossils indicating the structure of Archaeopteryx lungs



3. Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced that birds evolved from theropod dinosaurs?

A. There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx.
B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs' lungs.
C. Theropod dinosaurs appear in the fossil record about 150 million years ago.
D. Theropod dinosaurs did not have fused clavicles.
E. Theropod dinosaurs had certain bones that look just like those of Archaeopteryx.




You have to really pullback from the passage in order to notice the general structure of it- really there's two traps with structure of the passage question- an answer that's too specific and an answer that's too broad. If you notice my highlights- this passage has this flow " x argues, x argues, x argues" The author then replies to those arguments and explains why they are fallacious.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 09 Nov 2017, 15:43
Nunuboy1994 wrote:
The only thing I don't understand about question 3 is that is says "skeptics" rather than "scientists." I narrowed down question 3 to B and D however I felt that skeptics could have referred to a different group of people? Or I suppose with question 3 it would be better to eliminate B because that statement is not necessarily supported by the passage? It doesn't say anywhere that scientists are challenging the lack of fossil lungs.

sananoor wrote:
Can anyone explain that why the answer of question 3 is D..why not A?

Quote:
3) Which of the following is mentioned in the passage as
an argument made by scientists who are unconvinced
that birds evolved from theropod dinosaurs?
A. There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx.
B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs’ lungs.
C. Theropod dinosaurs appear in the fossil record about 150 million years ago.
D. Theropod dinosaurs did not have fused clavicles.
E. Theropod dinosaurs had certain bones that look just like those of Archaeopteryx

The passage states that "some scientists remain unconvinced." In other words, some scientists are skeptical. Thus, those scientists are the skeptics.

The author presents three arguments made by scientists who are unconvinced that birds evolved from theropod dinosaurs:

    1) Theropods appeared too late to have given rise to birds.
    2) The fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods.
    3) The complex lungs of birds could not have evolved from theropod lungs.

Choice (D) specifically refers to the second item in the list.

Choice (B) is not an argument made by the skeptics. Rather, it is a statement made by the author to show that #3 in the list cannot be supported or falsified at the moment.

As for choice (A), notice the word "after". There ARE certainly theropod fossils dating from after the time of the Archaeopteryx. The passage tells us that 150 million-year-old Archaeopteryx fossils have been found and that 115 million-year-old theropod fossils have been found. The problem, according to the skeptics, is that there are no known theropod dinosaur fossils dating from a period BEFORE the time of the Archaeopteryx.

Choice (D) is the best answer.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 03 Aug 2018, 12:32
Prateek176 wrote:

For Q.No2. C and B look so similar. Can you explain how you eliminated B??

Answered in this post above: https://gmatclub.com/forum/gmat-prep-rc ... l#p1767742. Let us know if that doesn't clear things up?
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 10 Apr 2019, 17:47
jennpt question 3: 'Skeptics also argue that the fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods' imply that 'Theropod dinosaurs did not have fused clavicles.'?
choice C :Looks like a very close choice in this one-->
Theropod dinosaurs appear in the fossil record about 150 million years ago.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 16 Apr 2019, 12:54
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Hi gmat8998

Thanks for the tag. For this question, it could help to first get very clear about what the question is asking you to find.
Quote:
Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced that birds evolved from theropod dinosaurs?
(bolding is mine)

OK, so we want a piece of evidence brought up by the people who DO NOT think that the therapods were the ancestors of birds. Or to put it another way, evidence raised to suggest that therapods COULD NOT BE the ancestors of birds.

Answer choice C actually does the opposite of what you are looking for, so it can't possibly be our answer.

When does the author discuss the age of the therapod fossils? Twice.
The first time, he brings up that we had only found therapod fossils that are 115 million years old. Why does he bring this up? To explain one argument of the skeptics, who say that therapods could not have been the ancestor of birds (which first started appearing 150 million years ago.)
The second time, he says "But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx." Why does he bring up this fact? To argue against the skeptics, and say that now we have fossils old enough to suggest that therapods are at least as old as the oldest bird - both now 150 million years old.

Answer choice C is describing the second piece of evidence, which is the one that argues AGAINST the critics and is used to say that therapods actually COULD have been the ancestors of birds.
If answer choice C had said "115 million" instead of "150 million", then it would have been a relevant answer choice.

Let me know if this helps, and also if you can determine where the error was in your thinking.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 20 Jun 2019, 18:34
GMATNinja wrote:
Nunuboy1994 wrote:
The only thing I don't understand about question 3 is that is says "skeptics" rather than "scientists." I narrowed down question 3 to B and D however I felt that skeptics could have referred to a different group of people? Or I suppose with question 3 it would be better to eliminate B because that statement is not necessarily supported by the passage? It doesn't say anywhere that scientists are challenging the lack of fossil lungs.

sananoor wrote:
Can anyone explain that why the answer of question 3 is D..why not A?

Quote:
3) Which of the following is mentioned in the passage as
an argument made by scientists who are unconvinced
that birds evolved from theropod dinosaurs?
A. There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx.
B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs’ lungs.
C. Theropod dinosaurs appear in the fossil record about 150 million years ago.
D. Theropod dinosaurs did not have fused clavicles.
E. Theropod dinosaurs had certain bones that look just like those of Archaeopteryx

The passage states that "some scientists remain unconvinced." In other words, some scientists are skeptical. Thus, those scientists are the skeptics.

The author presents three arguments made by scientists who are unconvinced that birds evolved from theropod dinosaurs:

    1) Theropods appeared too late to have given rise to birds.
    2) The fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods.
    3) The complex lungs of birds could not have evolved from theropod lungs.

Choice (D) specifically refers to the second item in the list.

Choice (B) is not an argument made by the skeptics. Rather, it is a statement made by the author to show that #3 in the list cannot be supported or falsified at the moment.

As for choice (A), notice the word "after". There ARE certainly theropod fossils dating from after the time of the Archaeopteryx. The passage tells us that 150 million-year-old Archaeopteryx fossils have been found and that 115 million-year-old theropod fossils have been found. The problem, according to the skeptics, is that there are no known theropod dinosaur fossils dating from a period BEFORE the time of the Archaeopteryx.

Choice (D) is the best answer.


Hi GMATNinja VeritasKarishma jennpt

The argument put forward by skeptics ( scientists who believed that birds could not have evolved from dinosaurs) , is :- "The fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods."
How does it mean that " Theropod dinosaurs did not have fused clavicles." ? Nowhere the passage mentions that "Theropod dinosaurs did not have fused clavicles." VeritasKarishma GMATNinja

Please explain.

Also Is option A incorrect because it is a wrong statement and certainly not an argument put forward by skeptics ?
It says that 'There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx."
This is a wrong statement as we know from the passage that there are indeed theropod dinosaur fossils which are 115 years old and 150 years old.
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Re: Although many lines of evidence indicate that birds evolved from groun  [#permalink]

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New post 20 Jun 2019, 20:48
sayan640 wrote:
GMATNinja wrote:
Nunuboy1994 wrote:
The only thing I don't understand about question 3 is that is says "skeptics" rather than "scientists." I narrowed down question 3 to B and D however I felt that skeptics could have referred to a different group of people? Or I suppose with question 3 it would be better to eliminate B because that statement is not necessarily supported by the passage? It doesn't say anywhere that scientists are challenging the lack of fossil lungs.

sananoor wrote:
Can anyone explain that why the answer of question 3 is D..why not A?

Quote:
3) Which of the following is mentioned in the passage as
an argument made by scientists who are unconvinced
that birds evolved from theropod dinosaurs?
A. There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx.
B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs’ lungs.
C. Theropod dinosaurs appear in the fossil record about 150 million years ago.
D. Theropod dinosaurs did not have fused clavicles.
E. Theropod dinosaurs had certain bones that look just like those of Archaeopteryx

The passage states that "some scientists remain unconvinced." In other words, some scientists are skeptical. Thus, those scientists are the skeptics.

The author presents three arguments made by scientists who are unconvinced that birds evolved from theropod dinosaurs:

    1) Theropods appeared too late to have given rise to birds.
    2) The fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods.
    3) The complex lungs of birds could not have evolved from theropod lungs.

Choice (D) specifically refers to the second item in the list.

Choice (B) is not an argument made by the skeptics. Rather, it is a statement made by the author to show that #3 in the list cannot be supported or falsified at the moment.

As for choice (A), notice the word "after". There ARE certainly theropod fossils dating from after the time of the Archaeopteryx. The passage tells us that 150 million-year-old Archaeopteryx fossils have been found and that 115 million-year-old theropod fossils have been found. The problem, according to the skeptics, is that there are no known theropod dinosaur fossils dating from a period BEFORE the time of the Archaeopteryx.

Choice (D) is the best answer.


Hi GMATNinja VeritasKarishma jennpt

The argument put forward by skeptics ( scientists who believed that birds could not have evolved from dinosaurs) , is :- "The fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods."
How does it mean that " Theropod dinosaurs did not have fused clavicles." ? Nowhere the passage mentions that "Theropod dinosaurs did not have fused clavicles." VeritasKarishma GMATNinja

Please explain.

Also Is option A incorrect because it is a wrong statement and certainly not an argument put forward by skeptics ?
It says that 'There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx."
This is a wrong statement as we know from the passage that there are indeed theropod dinosaur fossils which are 115 years old and 150 years old.


"The fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods."

You are given that birds have fused clavicles. You are also given that theropods have UNFUSED clavicles (so their clavicles are not fused together). So you are given that clavicles of theropods were not fused together.
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Re: Although many lines of evidence indicate that birds evolved from groun   [#permalink] 20 Jun 2019, 20:48

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