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# Extinction is a process that can depend on a variety of

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Manager
Joined: 29 Sep 2006
Posts: 94
Extinction is a process that can depend on a variety of [#permalink]

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10 Oct 2006, 15:04
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Extinction is a process that can depend on a variety of ecological, geographical, and physiological variables. These variables affect different species of organisms in different ways, and should, therefore, yield a random pattern of extinctions. However, the fossil record shows that extinction occurs in a surprisingly definite pattern, with many species vanishing at the same time.
Which of the following, if true, forms the best basis for at least a partial explanation of the patterned extinctions revealed by the fossil record?
(A) Major episodes of extinction can result from widespread environmental disturbances that affect numerous different species.
(B) Certain extinction episodes selectively affect organisms with particular sets of characteristics unique to their species.
(C) Some species become extinct because of accumulated gradual changes in their local environments.
(D) In geologically recent times, for which there is no fossil record, human intervention has changed the pattern of extinctions.
(E) Species that are widely dispersed are the least likely to become extinct.
SVP
Joined: 05 Jul 2006
Posts: 1747

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10 Oct 2006, 15:46
I think it is D
Intern
Joined: 25 Sep 2006
Posts: 23

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10 Oct 2006, 16:38
should be A

theory says x
example shows NOT x

ayushi wrote:
Extinction .. depend on a variety of .. variables. .. affect different species ..different ways, ..random pattern ..record shows that extinction occurs ..definite pattern, ..species vanishing at the same time.

Which of the following, if true, forms the best basis for at least a partial explanation of the patterned extinctions revealed by the fossil record?

we need to isolate basis for at least a partial explanation

(A) Major episodes of extinction can result from widespread environmental disturbances that affect numerous different species.
Intern
Joined: 06 Sep 2006
Posts: 27

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10 Oct 2006, 17:14
One vote for A
Manager
Joined: 29 Sep 2006
Posts: 94

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10 Oct 2006, 17:31
OA Is A
Director
Joined: 23 Jun 2005
Posts: 841
GMAT 1: 740 Q48 V42

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10 Oct 2006, 18:54
A, even though OA has been posted already.
VP
Joined: 21 Mar 2006
Posts: 1127
Location: Bangalore

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11 Oct 2006, 04:34
Narrowed it down to A and B. B does not explain why the extinction patterns should be definite. A offers an explantion. Has to be A.
VP
Joined: 25 Jun 2006
Posts: 1166

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11 Oct 2006, 18:56
A 2
11 Oct 2006, 18:56
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