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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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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

Please explain.
[Reveal] Spoiler: OA

Last edited by dentobizz on 21 Oct 2013, 22:06, edited 4 times in total.
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New post 20 Feb 2007, 23:07
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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New post 20 Feb 2007, 23:17
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

Please explain.


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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New post 21 Feb 2007, 00:44
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

Please explain.


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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New post 29 Apr 2011, 10:42
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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New post 17 Mar 2012, 15:54
The answer should be A:

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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New post 18 Mar 2012, 23:23
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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New post 13 Oct 2013, 09:37
whamberto wrote:
The answer should be A:

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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chimom wrote:
whamberto wrote:
The answer should be A:

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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New post 15 Oct 2013, 07:55
igotthis wrote:
chimom wrote:
whamberto wrote:
The answer should be A:

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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New post 29 Jan 2015, 09:59
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Re: Extinction is a process that can depend on a variety of [#permalink]

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New post 10 May 2016, 06:14
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

Please explain.


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

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New post 02 Apr 2017, 20:16
Argument Construction

Situation The fossil record reveals that species become extinct in a surprisingly definite pattern, with multiple species vanishing simultaneously.
Reasoning Which point provides a basis for explaining the pattern? The passage states that the process of extinction depends on so many variables—in the ecology and geography of the environment and in the physiology of the species—that the expected outcome would be a random pattern of extinctions. Yet a definite pattern is found instead. What could explain the disappearance of multiple species at the same time? If there were significant widespread changes in the environment, multiple species could be affected simultaneously, causing their extinction.

A Correct. This statement properly identifies a basis for explaining the pattern of many species becoming
extinct simultaneously.

B This explanation of selective extinction does not explain how many species become extinct at the same
time.

C This explanation addresses only some species, not many species.

D The passage is based on what the fossil record suggests; more recent times, having no fossil record, are outside the consideration of the passage.

E Indicating which species are least likely to become extinct does not explain a pattern of simultaneous extinction of many species.

The correct answer is A.
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New post 04 Apr 2017, 19:09
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


Option A provides a reason that covers a wide variety of species that extincted over a relative period of time and is therefore correct.
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Re: Extinction is a process that can depend on a variety of [#permalink]

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New post 05 Apr 2017, 13:00
As this is a CR question, let’s begin by reading the Question Stem: this question is EXPLAIN THE ARGUMENT question


Premise:
1. Extinction  Depends  ecological, geographical and physiological variables
2. Variables affect different species  different ways  Hence, should yield random pattern of extinctions
3. However  Fossil record shows  extinction occurs in a surprisingly definite pattern  MANY species vanishing at the same time

We need to look for option which can provide us with a reason where one or multiple variables impact multiple species at the same time.

(A) Major episodes of extinction can result from widespread environmental disturbances that affect numerous different species.
- This looks the correct answer, it is telling us that widespread environmental disturbances have affected different species (One variable impacting multiple species). Lets read other options as well. (A is the CORRECT answer)

(B) Certain extinction episodes selectively affect organisms with particular sets of characteristics unique to their species.
- Problem with this is it is referring to a specific species and not multiple, hence this does not explain what we are looking for

(C) Some species become extinct because of accumulated gradual changes in their local environments.
- Again referring to some species not necessarily multiple species

(D) In geologically recent times, for which there is no fossil record, human intervention has changed the pattern of extinctions.
- We are not talking about any recent times in this passage neither specifically about human interventions

(E) Species that are widely dispersed are the least likely to become extinct
- This goes against of what we are looking for

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Re: Extinction is a process that can depend on a variety of   [#permalink] 05 Apr 2017, 13:00
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