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# Amphibian populations are declining in numbers worldwide.

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Director
Joined: 14 Jan 2007
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Amphibian populations are declining in numbers worldwide. [#permalink]  06 Jul 2007, 01:45
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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
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.
Senior Manager
Joined: 04 Jun 2007
Posts: 350
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Re: CR - Amphibian populations [#permalink]  06 Jul 2007, 02:38
vshaunak@gmail.com wrote:
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.

I would pick A. It does not relate to amphibians in any way.
Manager
Joined: 29 Jan 2007
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A it should be .

Even if there are more raditations which can damage genes , it doesnt not have any effect on the argument. Argument is totally based on UV - B rays .

~sara
Director
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Well we are supposed to pick the best available option. So, by POE, I pick A since i could not elliminate anything else.
Manager
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why not D ok A is irrelevant but D is weakening the argument...am I wrong somewhere
Senior Manager
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nehanishika wrote:
why not D ok A is irrelevant but D is weakening the argument...am I wrong somewhere

D would not be ok for me, since it talks about habitat and not population. If the habitat were to remain unchanged, but still the population is reducing, it does strengthen the argument.
Manager
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A

For D
If natural habitat of amphibians had become smaller over the past century, there was a danger of them reducing in number.
Director
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OA is 'A'.
Intern
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The author asserts that the main cause is the "the depletion of the ozone layer", not the UV-B. Thus, to support the author's conclusion, the fact that UV-B is the only type that can damage genes is not necessary.

There could be any kinds of rays that can damage genes.
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