Extinction is a process that can depend on a variety of : GMAT Critical Reasoning (CR)
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# Extinction is a process that can depend on a variety of

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Extinction is a process that can depend on a variety of [#permalink]

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20 Feb 2007, 21:47
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Official Guide for GMAT Verbal Review, 2nd Edition
Practice Question
Question No.: 8
Page: 118
Difficulty:

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

[Reveal] Spoiler: OA

Last edited by dentobizz on 21 Oct 2013, 21:06, edited 4 times in total.
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20 Feb 2007, 22:07
Easy A!

D, E - they are clearly out of scope
B - too narrow in scope. It talks only about 'certain extinctions'.
C - Ok. we know why 'Some species' became extince. What about the others? Again, too narrow in scope.
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Re: CR - patterned extinctions [#permalink]

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20 Feb 2007, 22:17
Juaz wrote:
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

fossil record shows definite pattern, with many species vanishing at the same time so there might be other variable/factor other than the mentioned ones that affects all species uniformly
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Re: CR - patterned extinctions [#permalink]

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20 Feb 2007, 23:44
AK wrote:
Juaz wrote:
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

fossil record shows definite pattern, with many species vanishing at the same time so there might be other variable/factor other than the mentioned ones that affects all species uniformly

Thanks guys. OA is A.
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Re: CR - patterned extinctions [#permalink]

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29 Apr 2011, 09:42
A is straight forward here
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Re: Extinction is a process that can depend on a variety of [#permalink]

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17 Mar 2012, 14:54

A. This answer choice gives us a reason that explains how extinction can occur suddenly with many species going extinct.

B. This answer choice gives an explanation for the extinction of a few species.

C. This answer choice explain only how "some species" become extinct.

D. We are only concerned about the times that have "fossil records."

E. We are not concerned about how species are least likely to become extinct.
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Re: Extinction is a process that can depend on a variety of [#permalink]

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18 Mar 2012, 22:23
straight A, nicely explained in above posts
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Re: Extinction is a process that can depend on a variety of [#permalink]

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13 Oct 2013, 08:37
whamberto wrote:

A. This answer choice gives us a reason that explains how extinction can occur suddenly with many species going extinct.

B. This answer choice gives an explanation for the extinction of a few species.

C. This answer choice explain only how "some species" become extinct.

D. We are only concerned about the times that have "fossil records."

E. We are not concerned about how species are least likely to become extinct.

Excuse me for digging again this thread. I understand all the explanation above and also agree with you guys that A is the best answer here. However, I'm still wondering that A just covers 1 point that extinction occurs simultaneously. What's about the part "definite pattern"? Considering this factor, I think the answer A cannot satisfy it.
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Re: Extinction is a process that can depend on a variety of [#permalink]

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13 Oct 2013, 08:48
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chimom wrote:
whamberto wrote:

A. This answer choice gives us a reason that explains how extinction can occur suddenly with many species going extinct.

B. This answer choice gives an explanation for the extinction of a few species.

C. This answer choice explain only how "some species" become extinct.

D. We are only concerned about the times that have "fossil records."

E. We are not concerned about how species are least likely to become extinct.

Excuse me for digging again this thread. I understand all the explanation above and also agree with you guys that A is the best answer here. However, I'm still wondering that A just covers 1 point that extinction occurs simultaneously. What's about the part "definite pattern"? Considering this factor, I think the answer A cannot satisfy it.

I think because the question asks: 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?
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Re: Extinction is a process that can depend on a variety of [#permalink]

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15 Oct 2013, 06:55
igotthis wrote:
chimom wrote:
whamberto wrote:

A. This answer choice gives us a reason that explains how extinction can occur suddenly with many species going extinct.

B. This answer choice gives an explanation for the extinction of a few species.

C. This answer choice explain only how "some species" become extinct.

D. We are only concerned about the times that have "fossil records."

E. We are not concerned about how species are least likely to become extinct.

Excuse me for digging again this thread. I understand all the explanation above and also agree with you guys that A is the best answer here. However, I'm still wondering that A just covers 1 point that extinction occurs simultaneously. What's about the part "definite pattern"? Considering this factor, I think the answer A cannot satisfy it.

I think because the question asks: 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?

Ah, now I see it. My mistake to not read the Question stem carefully. Thank you a lot!!
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Re: Extinction is a process that can depend on a variety of [#permalink]

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29 Jan 2015, 08:59
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Re: Extinction is a process that can depend on a variety of [#permalink]

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10 May 2016, 05:14
Juaz wrote:
Official Guide for GMAT Verbal Review, 2nd Edition
Practice Question
Question No.: 8
Page: 118
Difficulty:

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

The assumption here is that the "variety of ecological, geographical, and physiological variables" are not the cause for the pattern.

A - give us exactly that what we need (strengthen the assumption).
B - This is focuses on specific species, and hence is not generalize enough to reference to a "group" of species.
C - Some could be 2, and hence not representative for a large population with a specific phenomenoa.
D - recent times are not relevant - Out of scope
E - out of scope
Re: Extinction is a process that can depend on a variety of   [#permalink] 10 May 2016, 05:14
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