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Amphibian populations are declining in numbers worldwide.

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Re: Amphibian populations are declining in numbers worldwide.  [#permalink]

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New post 25 Feb 2018, 16:01
why A is the answer? please help me, experts
Also, is this a good gmat question that has a chance to appear on the actual exam?
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Re: Amphibian populations are declining in numbers worldwide.  [#permalink]

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New post 25 Feb 2018, 16:06
According to the official explanation, the argument concerns with the damage by the UV-B, not the types.
The statement A is neutral, not positive or negative. In other words, A can only be correct if A has an assumption that UV-B is bad for amphibians, and UV-B only only causes damage when the ozone is depleted. Otherwise, there muse be a direct connection between the ozone layer and the amphibians.
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Re: Amphibian populations are declining in numbers worldwide.  [#permalink]

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New post 12 Jul 2018, 16:22
nightblade354 wrote:
I want to bump this for discussion. I chose D, and even after reading the explanations above I am still not convinced it is A.

If we consider D, predation and starvation could affect population size. So when it says habitat has not shrunk, that means another cause is to blame. Are we not supposed to consider outside information in this case? My understanding is that we can on S/W questions.

Also, I know how to negate general assumption questions, but not S/W questions. Help on this would be appreciated.

Posted from my mobile device



Finally, after an hour spending on this question, I realized that D actually strengthens the argument. because D says that natural habitat has now decreased and the meaning of natural habitat is the area to live. so this one removes the alternate cause if any for the effect to be created.

A --> nowhere it says because of damaged genes the population decreases. hence it does not strengthen the argument.
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Re: Amphibian populations are declining in numbers worldwide.  [#permalink]

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New post 12 Jul 2018, 23:08
The natural habitat did not become smaller, implies it has either remained as large as it was or become larger, either of which strengthens the fact that it was not because of the decrease in natural habitat which caused the population decline. So must be depletion of the ozone layer.

Read this better explanation if you want to.
magnolia wrote:
What OE says about D? Why does it strengthen?

D) The natural habitat of amphibians has not become smaller over the past century.


Hope it helps!
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Re: Amphibian populations are declining in numbers worldwide. &nbs [#permalink] 12 Jul 2018, 23:08

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Amphibian populations are declining in numbers worldwide.

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