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Zoologists warn of an imminent surge in the number of bird species tha

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Zoologists warn of an imminent surge in the number of bird species tha  [#permalink]

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New post 25 Feb 2015, 20:23
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Zoologists warn of an imminent surge in the number of bird species that will become extinct within this century. Nevertheless, these zoologists are wrong. One need only consider the information gathered on native North American raptors, such as bald eagles and peregrine falcons. Several of these species came close to vanishing between 1900 and 1970, but since 1970, the local populations of these raptors have rebounded. The answer to which of the following questions provides information that would be most helpful in evaluating the argument above?


A. How many species of non-native raptors have been introduced into North America since 1970?

B. What special efforts, if any, have been made to rescue native North American raptors since 1970?

C. How many years’ experience do the zoologists have in evaluating patterns of extinction among animals?

D. To what degree have native North American raptors migrated to other parts of the world?

E. How many acres of woodland are set aside each year as bird refuges?


This question is part of the GMAT Club Critical Reasoning : Evaluate Revision Project.

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Re: Zoologists warn of an imminent surge in the number of bird species tha  [#permalink]

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New post 25 Feb 2015, 22:01
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souvik101990 wrote:
This question is part of the GMAT Club Critical Reasoning : Evaluate Revision Project.

Zoologists warn of an imminent surge in the number of bird species that will become extinct within this century. Nevertheless, these zoologists are wrong. One need only consider the information gathered on native North American raptors, such as bald eagles and peregrine falcons. Several of these species came close to vanishing between 1900 and 1970, but since 1970, the local populations of these raptors have rebounded. The answer to which of the following questions provides information that would be most helpful in evaluating the argument above?

A. How many species of non-native raptors have been introduced into North America since 1970?

B. What special efforts, if any, have been made to rescue native North American raptors since 1970?

C. How many years’ experience do the zoologists have in evaluating patterns of extinction among animals?

D. To what degree have native North American raptors migrated to other parts of the world?

E. How many acres of woodland are set aside each year as bird refuges?


ans B..
only B gives us the reason to evaluate the argument whether these species rebound on its own or due to some special efforts of the government/ NGOs/any other org
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Re: Zoologists warn of an imminent surge in the number of bird species tha  [#permalink]

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New post 26 Feb 2015, 13:39
A. How many species of non-native raptors have been introduced into North America since 1970?
We are concerned about other bird species not non-native raptors -- OUT

B. What special efforts, if any, have been made to rescue native North American raptors since 1970?
If efforts were made...then may be its because of those efforts the population of raptors increased. Are going to adopt same measures for other bird species ? --- Sound good -- Keep -- revisit

C. How many years’ experience do the zoologists have in evaluating patterns of extinction among animals?
LOL -- OUT

D. To what degree have native North American raptors migrated to other parts of the world?
I don't care! -- OUT
E. How many acres of woodland are set aside each year as bird refuges?
Ditto -- OUT

B it is
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Re: Zoologists warn of an imminent surge in the number of bird species tha  [#permalink]

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New post 26 Feb 2015, 22:56
Hi Souvik,

We are getting lot of questions for us to practice here fro you. Firstly, thanks for that...

However are these questions really a 700+ level ones? I feel like real GMAT questions of 700+ level will be more subtle... Please help..

Thanks again..

By the way, the answer to the question is B... If efforts were taken that could have been the cause of the rebound...
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Re: Zoologists warn of an imminent surge in the number of bird species tha  [#permalink]

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New post 23 Sep 2016, 06:17
souvik101990 wrote:
This question is part of the GMAT Club Critical Reasoning : Evaluate Revision Project.

Zoologists warn of an imminent surge in the number of bird species that will become extinct within this century. Nevertheless, these zoologists are wrong. One need only consider the information gathered on native North American raptors, such as bald eagles and peregrine falcons. Several of these species came close to vanishing between 1900 and 1970, but since 1970, the local populations of these raptors have rebounded. The answer to which of the following questions provides information that would be most helpful in evaluating the argument above?

A. How many species of non-native raptors have been introduced into North America since 1970?

B. What special efforts, if any, have been made to rescue native North American raptors since 1970?

C. How many years’ experience do the zoologists have in evaluating patterns of extinction among animals?

D. To what degree have native North American raptors migrated to other parts of the world?

E. How many acres of woodland are set aside each year as bird refuges?


if to protect the native NA raptors, special efforts were made, then clearly the author of the argument is wrong, and the zoologists are right.
if not, then the author is right.

a correct answer to an evaluate question, if answered yes or not, either supports or shatters the conclusion.

B meets all the conditions.
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Re: Zoologists warn of an imminent surge in the number of bird species tha  [#permalink]

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New post 05 Feb 2017, 01:57
The conclusion of the argument is that the rate of extinction of bird species will not surge in this century. Evidence from native North American raptors (birds of prey) is cited: namely, that even though several such species nearly vanished between 1900 and 1970, the populations of these birds have since rebounded. We are asked to select a question which would, when answered, provide information that would help us evaluate this claim.

(A) This answer choice inquires about the introduction of non-native raptors. However, the argument cites as evidence the resurgence in native raptor populations. Thus, this question does not shed light on the relevance of the evidence.
(B) CORRECT. This question points to an unwarranted assumption on the author's part. The author assumes that the rebound in native North American raptor populations since 1970 was not due to any special effort to save these species. If special efforts have been made to save these raptor species, then one might not be able to generalize this evidence to other bird species or to make predictions about population trends in the next century, using this evidence.
(C) This question is irrelevant: the argument does not depend in any way on the experience of the zoologists. It hinges instead on the trend in raptor populations that the author uses to justify his or her point.
(D) This question is irrelevant. Note that the given evidence states that "local populations of these raptors have rebounded." Thus, population increases of native North American raptors outside of North America are not pertinent.
(E) This question is irrelevant: the argument does not depend in any way on the number of acres of woodland set aside as bird refuges.
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Re: Zoologists warn of an imminent surge in the number of bird species tha  [#permalink]

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New post 08 Feb 2017, 14:35
A. How many species of non-native raptors have been introduced into North America since 1970?
The number of species is irrelevant in the reasoning provided

B. What special efforts, if any, have been made to rescue native North American raptors since 1970?
waht were the special effort put if any to save the bald eagle from extinction is the major factor to decide if the claim from the zoologist is correct or not.

C. How many years’ experience do the zoologists have in evaluating patterns of extinction among animals?
The experience of evalution of the patterns is irrelevant since the zoologist may study the preobserved patterns and still have vast knowledge and information rather than having first hand experience.

D. To what degree have native North American raptors migrated to other parts of the world?
The study of the north american raptor ws done throughout the world and not just in the north america therfore the degree to which they migrate is not relevant to the argument.

E. How many acres of woodland are set aside each year as bird refuges?
Out of scope.
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Re: Zoologists warn of an imminent surge in the number of bird species tha  [#permalink]

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New post 29 Oct 2018, 05:47
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Zoologists warn of an imminent surge in the number of bird species tha &nbs [#permalink] 29 Oct 2018, 05:47
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