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# Some scientists believe that 65 million years ago an

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Some scientists believe that 65 million years ago an [#permalink]

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27 Sep 2009, 11:14
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Some scientists believe that 65 million years ago an asteroid struck what is now the Yucatan Peninsula, thereby causing extinction of the dinosaurs. These scientists have established that such a strike could have hurled enough debris into the atmosphere to block sunlight and cool the atmosphere. Without adequate sunlight, food sources for herbivorous dinosaurs would have disappeared, and no dinosaurs could have survived a prolonged period of low temperatures. These same scientists, however, have also established that most debris launched by the asteroid would have settled to the ground within six months, too soon for the plants to disappear or the dinosaurs to freeze.
Which one of the following, if true, most helps to resolve the apparent discrepancy between the scientists’ beliefs and the scientists’ results, as described above?
(A) Loss of the herbivorous dinosaurs would have deprived the carnivorous dinosaurs of their food source.
(B) Dinosaurs inhabited most landmasses on the planet but were not especially abundant in the area of the asteroid strike.
(C) A cloud of debris capable of diminishing sunlight by 20 percent would have cooled the earth’s surface by 7 to 10 degrees Celsius.
(D) The asteroid was at least 9.6 km in diameter, large enough for many dinosaurs to be killed by the strike itself and by subsequent tidal waves.
(E) Dinosaurs were susceptible to fatal respiratory problems cause by contamination of the air by asteroid debris.
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Re: dinosaurs [#permalink]

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27 Sep 2009, 11:22
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noboru wrote:
Some scientists believe that 65 million years ago an asteroid struck what is now the Yucatan Peninsula, thereby causing extinction of the dinosaurs. These scientists have established that such a strike could have hurled enough debris into the atmosphere to block sunlight and cool the atmosphere. Without adequate sunlight, food sources for herbivorous dinosaurs would have disappeared, and no dinosaurs could have survived a prolonged period of low temperatures. These same scientists, however, have also established that most debris launched by the asteroid would have settled to the ground within six months, too soon for the plants to disappear or the dinosaurs to freeze.
Which one of the following, if true, most helps to resolve the apparent discrepancy between the scientists’ beliefs and the scientists’ results, as described above?
(A) Loss of the herbivorous dinosaurs would have deprived the carnivorous dinosaurs of their food source.
(B) Dinosaurs inhabited most landmasses on the planet but were not especially abundant in the area of the asteroid strike.
(C) A cloud of debris capable of diminishing sunlight by 20 percent would have cooled the earth’s surface by 7 to 10 degrees Celsius.
(D) The asteroid was at least 9.6 km in diameter, large enough for many dinosaurs to be killed by the strike itself and by subsequent tidal waves.
(E) Dinosaurs were susceptible to fatal respiratory problems cause by contamination of the air by asteroid debris.

I think A, B, and D are irrelevant.

Since the passage claims that 6 months was enough to freeze the dinosaurs and kill plants I drop C as well. E seems the right answer, since dinosaurs with respiratory problems could've easily died of contamination. And maybe the CO2 levels in the atmosphere were affected as well, killing the plants on the earth. (This last one is an assumption though.)

So, IMO E.
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Re: dinosaurs [#permalink]

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27 Sep 2009, 11:36
arammug wrote:
noboru wrote:
Some scientists believe that 65 million years ago an asteroid struck what is now the Yucatan Peninsula, thereby causing extinction of the dinosaurs. These scientists have established that such a strike could have hurled enough debris into the atmosphere to block sunlight and cool the atmosphere. Without adequate sunlight, food sources for herbivorous dinosaurs would have disappeared, and no dinosaurs could have survived a prolonged period of low temperatures. These same scientists, however, have also established that most debris launched by the asteroid would have settled to the ground within six months, too soon for the plants to disappear or the dinosaurs to freeze.
Which one of the following, if true, most helps to resolve the apparent discrepancy between the scientists’ beliefs and the scientists’ results, as described above?
(A) Loss of the herbivorous dinosaurs would have deprived the carnivorous dinosaurs of their food source.
(B) Dinosaurs inhabited most landmasses on the planet but were not especially abundant in the area of the asteroid strike.
(C) A cloud of debris capable of diminishing sunlight by 20 percent would have cooled the earth’s surface by 7 to 10 degrees Celsius.
(D) The asteroid was at least 9.6 km in diameter, large enough for many dinosaurs to be killed by the strike itself and by subsequent tidal waves.
(E) Dinosaurs were susceptible to fatal respiratory problems cause by contamination of the air by asteroid debris.

I think A, B, and D are irrelevant.

Since the passage claims that 6 months was enough to freeze the dinosaurs and kill plants I drop C as well. E seems the right answer, since dinosaurs with respiratory problems could've easily died of contamination. And maybe the CO2 levels in the atmosphere were affected as well, killing the plants on the earth. (This last one is an assumption though.)

So, IMO E.

Could u explain bit further why you see D irrelevant?
Thanks
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Re: dinosaurs [#permalink]

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27 Sep 2009, 11:38
my ans = D

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Re: dinosaurs [#permalink]

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27 Sep 2009, 20:40
Very confused between A and E, but I'll go with A because this is the only one resolve the paradox.
Even though the dinosaurs didn't die due to freeze (because debris settled down soon), but herbivorous dinosaurs all died because lack of sunlight lead to lack of food sources, according to A, loss of the herbivorous dinosaurs would affect the food source of the carnivorous dinosaurs.
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Re: dinosaurs [#permalink]

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27 Sep 2009, 22:17
IMO D
Whats OA?

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Re: dinosaurs [#permalink]

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28 Sep 2009, 02:44
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noboru wrote:
arammug wrote:
noboru wrote:
Some scientists believe that 65 million years ago an asteroid struck what is now the Yucatan Peninsula, thereby causing extinction of the dinosaurs. These scientists have established that such a strike could have hurled enough debris into the atmosphere to block sunlight and cool the atmosphere. Without adequate sunlight, food sources for herbivorous dinosaurs would have disappeared, and no dinosaurs could have survived a prolonged period of low temperatures. These same scientists, however, have also established that most debris launched by the asteroid would have settled to the ground within six months, too soon for the plants to disappear or the dinosaurs to freeze.
Which one of the following, if true, most helps to resolve the apparent discrepancy between the scientists’ beliefs and the scientists’ results, as described above?
(A) Loss of the herbivorous dinosaurs would have deprived the carnivorous dinosaurs of their food source.
(B) Dinosaurs inhabited most landmasses on the planet but were not especially abundant in the area of the asteroid strike.
(C) A cloud of debris capable of diminishing sunlight by 20 percent would have cooled the earth’s surface by 7 to 10 degrees Celsius.
(D) The asteroid was at least 9.6 km in diameter, large enough for many dinosaurs to be killed by the strike itself and by subsequent tidal waves.
(E) Dinosaurs were susceptible to fatal respiratory problems cause by contamination of the air by asteroid debris.

I think A, B, and D are irrelevant.

Since the passage claims that 6 months was enough to freeze the dinosaurs and kill plants I drop C as well. E seems the right answer, since dinosaurs with respiratory problems could've easily died of contamination. And maybe the CO2 levels in the atmosphere were affected as well, killing the plants on the earth. (This last one is an assumption though.)

So, IMO E.

Could u explain bit further why you see D irrelevant?
Thanks

A is irrelevant because no where it is mentioned that food resources were diminished after the strike..
D is irrelevant becoz ....it only talks about many not all dinosaurs ...
E resolves the discrepancy very well...

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Re: dinosaurs [#permalink]

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28 Sep 2009, 04:00
One more for E.

After event in D some could survive breed.
E clearly explaines the paradox.

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28 Sep 2009, 04:24
C or D.

I go with C. I think D offers an alternative reason to extinction, why extinction occurred despite debris settling quickly. I think the correct answer should link the debris with the process of extinction. C does so. That's my GUESS.

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28 Sep 2009, 06:52
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E... it gives a reason why the dinosaurs could have been killed off without depending on temperature or starvation. But also explains this would have been caused by the asteroid.. supporting the original claim

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28 Sep 2009, 17:55
agree with E, D talks about most but not all dinosaurs...most dinosaur dying does not equal to extinction..

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Re: dinosaurs [#permalink]

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28 Sep 2009, 19:47
E.... It's the only one that provides an alternative consequence of the asteroid that would have killed off all the dinosaurs in the short time (you can't hold your breath that long).
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28 Sep 2009, 22:23
Even i would go with E
E is convincing than the rest of them

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27 Oct 2009, 13:24
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noboru wrote:
Some scientists believe that 65 million years ago an asteroid struck what is now the Yucatan Peninsula, thereby causing extinction of the dinosaurs. These scientists have established that such a strike could have hurled enough debris into the atmosphere to block sunlight and cool the atmosphere. Without adequate sunlight, food sources for herbivorous dinosaurs would have disappeared, and no dinosaurs could have survived a prolonged period of low temperatures. These same scientists, however, have also established that most debris launched by the asteroid would have settled to the ground within six months, too soon for the plants to disappear or the dinosaurs to freeze.
Which one of the following, if true, most helps to resolve the apparent discrepancy between the scientists’ beliefs and the scientists’ results, as described above?
(A) Loss of the herbivorous dinosaurs would have deprived the carnivorous dinosaurs of their food source.
We are talking here about fast cause of extinction. I believe there must be a longer period of time (>6months) in order all carnivorous dinos to kill herbivorous ones.
(B) Dinosaurs inhabited most landmasses on the planet but were not especially abundant in the area of the asteroid strike.completely irrelevant.
(C) A cloud of debris capable of diminishing sunlight by 20 percent would have cooled the earth’s surface by 7 to 10 degrees Celsius.this choice states concrete facts about the freezing processes. we do not need that.
(D) The asteroid was at least 9.6 km in diameter, large enough for many dinosaurs to be killed by the strike itself and by subsequent tidal waves.ok, D. very popular choice here. However, it presents an evidence about the size of the asteroid and its consequences. In the argument there is an information about debris and/or freezing, not tidal waves or the size of an asteroid. In addition, it is stated that 6 months is a short period for plants to disappear. If there were waves - where were the plants then?
(E) Dinosaurs were susceptible to fatal respiratory problems cause by contamination of the air by asteroid debris. best choice. in the scope of the argument and provides an alternative reason why plants survived and dinos did not.

E.

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27 Oct 2009, 17:58
E clearly resolves the paradox . explanations already provided in greater length
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27 Oct 2009, 19:23
IMO E,

This option properly resolve the paradox

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Re: dinosaurs [#permalink]

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27 Oct 2009, 23:02
noboru wrote:
Some scientists believe that 65 million years ago an asteroid struck what is now the Yucatan Peninsula, thereby causing extinction of the dinosaurs. These scientists have established that such a strike could have hurled enough debris into the atmosphere to block sunlight and cool the atmosphere. Without adequate sunlight, food sources for herbivorous dinosaurs would have disappeared, and no dinosaurs could have survived a prolonged period of low temperatures. These same scientists, however, have also established that most debris launched by the asteroid would have settled to the ground within six months, too soon for the plants to disappear or the dinosaurs to freeze.
Which one of the following, if true, most helps to resolve the apparent discrepancy between the scientists’ beliefs and the scientists’ results, as described above?
(A) Loss of the herbivorous dinosaurs would have deprived the carnivorous dinosaurs of their food source.
(B) Dinosaurs inhabited most landmasses on the planet but were not especially abundant in the area of the asteroid strike.
(C) A cloud of debris capable of diminishing sunlight by 20 percent would have cooled the earth’s surface by 7 to 10 degrees Celsius.
(D) The asteroid was at least 9.6 km in diameter, large enough for many dinosaurs to be killed by the strike itself and by subsequent tidal waves.
(E) Dinosaurs were susceptible to fatal respiratory problems cause by contamination of the air by asteroid debris.

Its E.

A assumes that the herbivorous dinosaurs became extinct. Yet we are told in the Q that the debris settled before plants died an thus there is no basis for concluding that the herbivorous dinosaurs became extinct.

B is completely irrelevant as is C.

D as others have mentioned the key-word here is many. The death of many dinosaurs is NOT equal to the extinction of dinosaurs.

E:This sentence explains why dinosaurs died from the impact even though the plants did not die and it wasn't cold enough for them to freeze to death. Therefore it solves the paradox.

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27 Oct 2009, 23:23
IMO E
"Many" is a keyword to negate option D

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28 Oct 2009, 07:19
Seems to be clearly E.

I've been wrong before tho

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Re: dinosaurs [#permalink]

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02 Nov 2009, 23:35
I'd go with E too!

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Re: dinosaurs   [#permalink] 02 Nov 2009, 23:35

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