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# Some scientists believe that 65 million years ago an

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Intern
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03 Nov 2009, 08:37
1
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E it is...where is the OA?

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05 Nov 2009, 03:20
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IMO D

E only mentions that they were susceptible and not actual contraction of infections caused by the debris

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

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15 May 2012, 01:41
10km,it's really large one,what a loss that i haven't seen that.

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

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16 May 2012, 00:29
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.

E....

the paradox between the belief and the result is what needs to be resolved....

the belief is that the asteroid debris blocked sunlight resulting in a loss of vegetation and thereby extinction of dinosaurs.... and the result is that asteroid debris never blocked sunlight because the debris settled within six months of the collision event....

A. blocked sunlight and subsequent vegetation loss led to B. extinction (not true as explained in the argument)

which would mean that

A. (something else) led to B. extinction...

only E seems to offer an alternative explanation....

A. ok... but does not explain extinction.. only says the food chain got disrupted...
B. straightforward reject..
C. too many numbers (7 to 10 degree celsius) that are useless in explaining extinction
D. of course the asteroid may be large enough to kill "many" dinosaurs but does that necessarily mean extinction?
E. relates how the asteroid debris would have caused extinction.... asteroid debris -> air contamination -> "fatal" respiratory problems -> WIPEOUT....

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

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16 May 2012, 00:35
E makes sence to me, cannot be anything else

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

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16 May 2012, 10:04
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.

+1 for E.
D is not correct because it states many dinosaurs and not all dinosaurs.

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

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16 May 2012, 11:17
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17 Jun 2012, 08:39
noboru wrote:
(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.

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

d) killing many dinosaurs isn't enough. why did all die then?
e) fatal respiratory problems for 6 months sounds like a valid reason for extinction.
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Re: Some scientists believe that 65 million years ago an [#permalink]

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02 Feb 2015, 14:03
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Re: Some scientists believe that 65 million years ago an [#permalink]

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22 Jul 2017, 16:48
Why is choice A wrong? I understood this choice as the carnivorous dinosaurs fed on herbivorous dinosaurs who became rare.

Thanks

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

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30 Jul 2017, 11:11
Mo2men wrote:
Why is choice A wrong? I understood this choice as the carnivorous dinosaurs fed on herbivorous dinosaurs who became rare.

Thanks

Choice (A) might be an accurate statement, but it does not explain the apparent discrepancy. The belief is that the asteroid would have "hurled enough debris into the atmosphere to block sunlight and cool the atmosphere." This would have caused the food sources for herbivorous dinosaurs to disappear.

BUT we seem to have a problem with this explanation: 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. If that's the case, what caused the extinction?

Quote:
(A) Loss of the herbivorous dinosaurs would have deprived the carnivorous dinosaurs of their food source.

As stated in choice (A), it is certainly true that loss of the herbivorous dinosaurs would have deprived the carnivorous dinosaurs of their food source, but this does not explain the apparent discrepancy. We need something that explains why the herbivorous dinosaurs would have become extinct in the first place.

Quote:
(E) Dinosaurs were susceptible to fatal respiratory problems cause by contamination of the air by asteroid debris.

Since the debris settled within six months, the asteroid most likely did not eliminate the food sources. So how did the asteroid cause the extinction? Well, if the debris led to fatal respiratory problems, then that could have killed off all or most of the dinosaurs. Choice (E) resolves the apparent discrepancy and is the correct choice.
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Re: Some scientists believe that 65 million years ago an   [#permalink] 30 Jul 2017, 11:11

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