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Some say that an asteroid colliding with Earth was responsible for the

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Re: Some say that an asteroid colliding with Earth was responsible for the  [#permalink]

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New post 13 Mar 2017, 16:00
Question Type: Inference

(A) No comparably catastrophic asteroid collision with Earth has occurred since the one that killed the vast majority of dinosaurs. - Incorrect. Very Extreme.

(B) Some members of each dinosaur species were killed either directly or indirectly by the impact of the asteroid collision with Earth. - Incorrect. We cannot conclude that some members of each dinosaur species were killed. May be an entire specie was separated from the group that faced an asteroid impact.

(C) All the members of at least one dinosaur species were killed either directly or indirectly by the impact of the asteroid collision with Earth. - Incorrect. Extreme.

(D) If the majority of dinosaurs were killed by an asteroid colliding with Earth, some dinosaurs lived at great distances from each other at the time of the collision. - Correct.

(E) It is possible to determine a close estimate of the number of dinosaurs that were killed, either directly or indirectly, by the asteroid collision with Earth - Incorrect. Out of scope. Estimating the number of deaths is not discussed at all in the argument.

Answer: D
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New post 17 Jun 2017, 13:26
The premise long sentence and choice a are hard to read.
As this is my first question.
I was hard to concentrate.

"dinosaurs lived far enough from the point of collision that they were not directly killed by the impact or by the drastic change in temperature when immense dust clouds created by the impact blocked the sun.'
"
a) The water supply used by the dinosaurs who survived the asteroid collision and subsequent change in global temperature had not become contaminated by lethal fallout from the collision.'
If I get the meaning of these 2 , I can get this right by negation technique.
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New post 10 Jul 2017, 02:20
I was thoroughly convinced with C. Not sure, how A is correct. Isn't water contamination a totally irrelevant point?
Since we're finding assumptions here, I don't think we are to cook up specific facts, rigt?

Please help. :(
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New post 10 Jul 2017, 04:03
While it is obvious that A is the correct answer choice, it is important to understand why C is incorrect. If you take a look again and pay attention to the flow of the argument, you'll notice that the fact that several dinosaurs survived the impact and the subsequent temperature change is a premise, not an assumption. Without the surviving dinosaurs, there is no argument. Also, this fact is not even necessarily true - notice the word "perhaps" in the sentence.

Another way to look at this fact is to regard it as a hypothetical situation: if there were surviving dinosaurs, they must have subsequently been killed by some other force, and if there were not any, ah well, there is nothing left to say. ;)
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Re: Some say that an asteroid colliding with Earth was responsible for the  [#permalink]

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New post 10 Jul 2017, 09:23
Clearly A is the answer. In CR, author always believes his or her argument is air-tight. For example, if according to author A caused B, then nothing else but only A caused B. Similarly, if A did not cause B, then anything related to A did not cause B.

Using above logic, only A stands out as it clearly points out that something related to asteroid collision may have caused the death of surviving dinosaurs.
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Re: Some say that an asteroid colliding with Earth was responsible for the  [#permalink]

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New post 11 Jul 2017, 10:05
Imo A
The argument says that the All dinosaur did not die because of the impact of the asteroid hitting the earth .
These must have been some dinosaur living far off areas which did not feel the impact of the asteroid.
Now for the dinosaur to survive in far off areas the increase in temperature should not have reached those areas.
hence A is the necessary assumption.
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New post 16 Oct 2018, 23:02
@bluseas,
Please correct me .
For option E, it might possible that because change in temperature lasted for years and gradually all the remaining dinosaurs died.
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Re: Some say that an asteroid colliding with Earth was responsible for the   [#permalink] 16 Oct 2018, 23:02

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