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# Amphibian populations are declining in numbers worldwide.

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Director
Joined: 18 Feb 2008
Posts: 509
Location: Kolkata
Followers: 5

Kudos [?]: 53 [0], given: 66

Amphibian populations are declining in numbers worldwide. [#permalink]  29 Jul 2008, 20:59
00:00

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5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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.

Thanks in advance for the explanations.Could eliminate few,but confused between two choices.
Manager
Joined: 18 Aug 2006
Posts: 62
Location: Houston TX
Followers: 1

Kudos [?]: 7 [0], given: 0

Re: Help with this CR... [#permalink]  29 Jul 2008, 21:20
My pick is A.
(A) Of the various types of radiation blocked by
atmospheric ozone, UV-B is the only type
that can damage genes. => does not strengthen the argument at all
(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. => it confirms that amphibians do not have protection from UV-B, causing their population decline, so strengthen the argument
(C) Atmospheric ozone has been significantly
depleted above all the areas of the world in
which amphibian populations are declining => confirms the conclusion
(D) The natural habitat of amphibians has not
become smaller over the past century. => eliminates other possible cause, so strengthens
(E) Amphibian populations have declined
continuously for the last 50 years => restates the situation, strengthens the argument
_________________

haveaniceday

Director
Joined: 18 Feb 2008
Posts: 509
Location: Kolkata
Followers: 5

Kudos [?]: 53 [0], given: 66

Re: Help with this CR... [#permalink]  31 Jul 2008, 08:17
thanks for the explanations.kudos.i was confused and went for D.Oa is indeed a.
Director
Joined: 25 Oct 2006
Posts: 653
Followers: 7

Kudos [?]: 148 [0], given: 6

Re: Help with this CR... [#permalink]  31 Jul 2008, 08:41
good explanation for A. Thnx
_________________

If You're Not Living On The Edge, You're Taking Up Too Much Space

Re: Help with this CR...   [#permalink] 31 Jul 2008, 08:41
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# Amphibian populations are declining in numbers worldwide.

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