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# depleted throughout the last 50 years. Atmospheric ozone

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depleted throughout the last 50 years. Atmospheric ozone [#permalink]

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03 Jun 2007, 16:52
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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

OA is A...but wouldn't D be correct? if the habitate has been maintained over the years, then it goes against the argument in the passage that the population is declining.
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03 Jun 2007, 19:39
A is correct as it talks about Genes affected by UV-B, which is not a problem to amphibians as per the passage..

D however suggests if the habitat is not reduced, clearly the UV-B should be responsible for the reduction in the number of amphibians...
03 Jun 2007, 19:39
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