Amphibian populations are declining in numbers worldwide. : GMAT Critical Reasoning (CR)
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Amphibian populations are declining in numbers worldwide.

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Senior Manager
Joined: 04 Sep 2008
Posts: 259
Location: Kolkata
Schools: La Martiniere for Boys
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Amphibian populations are declining in numbers worldwide. [#permalink]

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03 Oct 2008, 04:38
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Amphibian populations are declining in numbers
worldwide. Not coincidentally, the earth’s ozone
layer has been continuously depleted throughout the
last 50 years. Atmospheric ozone blocks UV-B, a
type of ultraviolet radiation that is continuously
produced by the sun, and which can damage genes.
Because amphibians lack hair, hide, or feathers to
shield them, they are particularly vulnerable to UV-B
radiation. In addition, their gelatinous eggs lack the
protection of leathery or hard shells. Thus, the
primary cause of the declining amphibian population
is the depletion of the ozone layer.
Each of the following, if true, would strengthen the
argument EXCEPT:
(A) Of the various types of radiation blocked by
atmospheric ozone, UV-B is the only type
that can damage genes.
(B) Amphibian populations are declining far more
rapidly than are the populations of
nonamphibian species whose tissues and
eggs have more natural protection from
UV-B.
(C) Atmospheric ozone has been significantly
depleted above all the areas of the world in
which amphibian populations are declining.
(D) The natural habitat of amphibians has not
become smaller over the past century.
(E) Amphibian populations have declined
continuously for the last 50 years.

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Re: Tough CR [#permalink]

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03 Oct 2008, 05:09
I think is D, becuase in D the author speaks about the natural habitat, not about amfibians.
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Re: Tough CR [#permalink]

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03 Oct 2008, 05:38
D
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Re: Tough CR [#permalink]

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02 Feb 2010, 13:52
vote for D
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Re: Amphibian populations are declining in numbers worldwide. [#permalink]

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24 Dec 2016, 06:42
Here the argument asks for co-relation of which does not help to proof of declining the population of amphibian versus the depletion of ozone layer in the atmosphere.
(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes.... Reason support for the decline in the amphibian population.
(B) Amphibian populations are declining far more rapidly than are the populations of non amphibian species whose tissues and eggs have more natural protection from UV-B..... suggest that as the amphibian does not have tissue and egg which does not protect the UV resulting in decline in the population.
(C) Atmospheric ozone has been significantly depleted above all the areas of the world in which amphibian populations are declining.---- Again, provide evidence for decline in amphibian population.
(D) The natural habitat of amphibians has not become smaller over the past century...... Does not support, Hence the answer.....
(E) Amphibian populations have declined continuously for the last 50 years.... In the argument it is mentioned that earth’s ozone layer has been continuously depleted throughout the last 50 years.... Give evidence for amphibian decline.

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Re: Amphibian populations are declining in numbers worldwide.   [#permalink] 24 Dec 2016, 06:42
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Amphibian populations are declining in numbers worldwide.

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