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A plausible explanation of the disappearance of the

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New post Updated on: 25 Apr 2019, 05:27
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A
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A plausible explanation of the disappearance of the dinosaurs is what is known as the comet theory. A large enough comet colliding with Earth could have caused a cloud of dust that enshrouded the planet and cooled the climate long enough to result in the dinosaur's demise.

Which of the following statements, if true, most seriously weakens the argument?

A) One of the various schools of paleontology adheres to an explanation for the disappearance of the dinosaurs that is significantly different from the comet theory.

B) Various species of animals from the same as dinosaurs and similar to them in physiology and habitat did not become extinct when dinosaurs did.

C) It can not be determined from a study of dinosaur skeletons whether the animals died from the effects of a dust cloud.

D) Many other animal species from the era of the dinosaurs did not become extinct at the same time the dinosaurs did.

E) The consequences for the vegetation and animals of comet colliding with Earth are not fully understood.

I found 3 weakeners here owing to causality. Seriously in the predicament. I was hitting immaculate accuracy in Weaken Questions when this hit me.
Let me know the explanations here.. OA to follow soon...

Originally posted by joshnsit on 25 Aug 2012, 06:01.
Last edited by nightblade354 on 25 Apr 2019, 05:27, edited 4 times in total.
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New post 25 Aug 2012, 06:28
Hey....new kid on the block

I would go with B ... This option talks about non extinction of animals from the same species as the dinosaurs ...for me makes sense and weakens the argument

The option D also talks about non extinction of animals of the same era, but these animals are of different species and so might have naturally adapted to the change in environment
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Re: A plausible explanation of the disappearance of the  [#permalink]

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New post 25 Aug 2012, 06:59
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gmatstalker2012 wrote:
Hey....new kid on the block

I would go with B ... This option talks about non extinction of animals from the same species as the dinosaurs ...for me makes sense and weakens the argument

The option D also talks about non extinction of animals of the same era, but these animals are of different species and so might have naturally adapted to the change in environment
B is obviously better than D. But, why couldnt it be A or C then? They also give different causes of dinosaur's death weakening the conclusion.
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New post 25 Aug 2012, 09:51
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Yes, the answer is B. If dinosaurs would be unable to survive the aftermath of a comet, you'd expect the same to be true of similar animals, so B casts doubt on the theory. As for the other answers you asked about:

A just says "some people don't agree with the comet theory". You can rule those types of answers out right away. Whether a few people disagree with the theory is irrelevant; we need facts to weaken an argument, not opinions.

C just says "studying dinosaur skeletons doesn't help us to evaluate the theory". So skeletons don't give us any information about the comet theory. So C neither strengthens nor weakens the argument. If C instead said that a study of skeletons gives reason to think dinosaurs died from an alternative cause, then C would be a good answer, but that's not what it says.
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New post 26 Aug 2012, 05:32
IanStewart wrote:
Yes, the answer is B. If dinosaurs would be unable to survive the aftermath of a comet, you'd expect the same to be true of similar animals, so B casts doubt on the theory. As for the other answers you asked about:

A just says "some people don't agree with the comet theory". You can rule those types of answers out right away. Whether a few people disagree with the theory is irrelevant; we need facts to weaken an argument, not opinions.

C just says "studying dinosaur skeletons doesn't help us to evaluate the theory". So skeletons don't give us any information about the comet theory. So C neither strengthens nor weakens the argument. If C instead said that a study of skeletons gives reason to think dinosaurs died from an alternative cause, then C would be a good answer, but that's not what it says.
@IanStewart. Though your comment about choice A makes sense, this info was new to me. To make your statement about choice A explicit, can we safely state that "Any opinion/belief/claim by an authority, whatever the status and credentials of the authority are, can't be used to disprove or raise doubt on author's opinion/belief/claim in an argument." ?
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New post 26 Aug 2012, 06:00
No,it doesn't work that way.Its just that the below statement is not strong enough to weaken the author's claim.
"One of the various schools of paleontology adheres to an explanation for the disappearance of the dinosaurs that is significantly different from the comet theory."
Also,in this statement,its just mentioned generally that the explanation differs to author's statement.If something concrete would've been mentioned,say something such as "X theory has stated that disappearance of dinosaurs took place because of Y reason" then we could have selected A.

Hope it helps,
Thanks!
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New post 26 Aug 2012, 11:43
joshnsit wrote:
@IanStewart. Though your comment about choice A makes sense, this info was new to me. To make your statement about choice A explicit, can we safely state that "Any opinion/belief/claim by an authority, whatever the status and credentials of the authority are, can't be used to disprove or raise doubt on author's opinion/belief/claim in an argument." ?


In this question, A is particularly unhelpful, because all it says is that some people disagree with the theory. That's generally true about most theories. I suppose in a similar question, if one answer said something like "most experts who have researched this issue disagree with the theory", that kind of answer would help to weaken the argument. But for GMAT purposes, I don't think that matters -- I don't think I've ever seen a real GMAT question where that type of 'appeal to universal authority' answer was even among the answer choices. In every real GMAT weakening question I've seen, the correct answer is based on flaws or gaps in the argument itself, and not on the opinions of experts. And whenever I've seen answers that read something like "some people think X", those answers are never correct, because the logical force of an argument is not substantially diminished by the opinions of a few people.
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New post 21 Dec 2018, 21:50
Could somebody give a detailed explanation for why D is wrong?

I am confused between B and D.
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New post 21 Dec 2018, 22:50
joshnsit wrote:
gmatstalker2012 wrote:
Hey....new kid on the block

I would go with B ... This option talks about non extinction of animals from the same species as the dinosaurs ...for me makes sense and weakens the argument

The option D also talks about non extinction of animals of the same era, but these animals are of different species and so might have naturally adapted to the change in environment
B is obviously better than D. But, why couldnt it be A or C then? They also give different causes of dinosaur's death weakening the conclusion.


Hi joshnsit

Could you please tell OA ? I would go with C
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New post 25 Apr 2019, 05:28
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Question edited and OA added. This is an LSAT question, by the way.
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New post 25 Apr 2019, 09:39
I am not sure about B.

Argument is talking only about Dinosaurs not other species.
Species similar to Dinosaur may or may not survive in conditions specified but it will not weaken the argument.Even if we negate this it will not strengthen the argument.

If we negate choice A,it will strengthen the argument and hence is a weaker in original state.
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New post 20 Jun 2019, 12:34
Can someone tell me why "D) Many other animal species from the era of the dinosaurs did not become extinct at the same time the dinosaurs did." is not the correct answer? One possible explanation could be : since era is a long time period, it could mean that they existed in the same "era" as dinosaurs but didnt necessarily exist when the extinction happened. Is my thinking correct?
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New post 21 Jun 2019, 17:54
A plausible explanation of the disappearance of the dinosaurs is what is known as the comet theory. A large enough comet colliding with Earth could have caused a cloud of dust that enshrouded the planet and cooled the climate long enough to result in the dinosaur's demise.

Premise: A large enough comet colliding with Earth could have caused a cloud of dust that enshrouded the planet and cooled the climate long enough to result in the dinosaur's demise.
Conclusion: A plausible explanation of the disappearance of the dinosaurs is what is known as the comet theory

OK, so pretty straightforward argument. Honestly, given the amount of ways the LSAT could have spun this, it is best not try and "pre-think" this one out and just hope to see an alternate explanation or a weakener.


Which of the following statements, if true, most seriously weakens the argument?

A) One of the various schools of paleontology adheres to an explanation for the disappearance of the dinosaurs that is significantly different from the comet theory. -- OK, cool. So these two theories aren't compatible. But, who cares? There could be 50,000 theories that agree with us. So this ridiculous. Out.

B) Various species of animals from the same as dinosaurs and similar to them in physiology and habitat did not become extinct when dinosaurs did. -- I am usually skeptical of comparison answers, but let's analyze this a little more. It is a similar species, with similar living conditions, and yet they didn't go extinct. Hmm. They are similar in almost every way but the name. This does weaken it, because these fake-twins stayed around and our Dinos didn't. Both would have needed to go extinct to not weaken this. Bingo!

C) It can not be determined from a study of dinosaur skeletons whether the animals died from the effects of a dust cloud. -- Tricky answer choice. They are trying to make you assume that because we do not know if something occurred, that it didn't occur. But this cannot be assumed! Maybe we just don't have the technology to analyze the bones, but they really did die from this. We just don't know. Out.

D) Many other animal species from the era of the dinosaurs did not become extinct at the same time the dinosaurs did. -- This is why I pause with comparison answers. Look at this and please realize why this is different then B. These animal species could be completely different than our dinos. They could be a super species that developed a resistance to clouds and somehow learned to absorb dust for energy. The species are not the same, so they could be completely, ridiculously different. When species go extinct today on Earth, does every species go extinct? No. This is why this is wrong. We adapt to situations, just as these other species could. Out.

E) The consequences for the vegetation and animals of comet colliding with Earth are not fully understood. -- Once more, who cares? Does this mean the vegetation died off? And if so, does that meant the dinos were dependent on plants? We cannot make these assumptions. Out.
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