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V01Q30

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Intern
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V01Q30 [#permalink] New post 26 Dec 2009, 11:08
Scientists studying climate change have found that one of the overall effects of global warming is not only a higher planetary temperature, but also a universal change in seasons, specifically earlier springs and later autumns. Though some argue that this is an advantage because it presents a longer summer growing season, others fear that too many animal species will be unable to adapt and will become extinct.

Which of the following is the best piece of evidence to support the conclusion that a longer growing season will hasten the extinction of some animal species?

A.Squirrel and chipmunk species are unable either to consume or to store all the nuts and berries produced during a longer growing season.
B.Fungus species typically produce spores only once a year and are unable to produce enough spores to release spores again before the end of a longer growing season.
C.Butterfly species that respond quickly to changes in temperature hatch caterpillars and undergo metamorphosis into butterflies earlier, flying away before bird species that feed exclusively on them have hatched their young.
D.Salmon species that rely on changes in temperature to signal the start of annual migrations leave their freshwater birthplaces earlier, before they have fed sufficiently on freshwater insects to reduce their number.
E. Reptile species that hibernate during winter months must emerge from hibernation sooner and spend a longer time searching for food before mating in mid-summer.


Please help me understand correct answer for this CR.
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Re: V01Q30 [#permalink] New post 27 Dec 2009, 19:30
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I will go with C

C.Butterfly species that respond quickly to changes in temperature hatch caterpillars and undergo metamorphosis into butterflies earlier, flying away before bird species that feed exclusively on them have hatched their young

butterflies will fly away earlier-> no food for species that eat only butterflies -> species will extinct
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Re: V01Q30 [#permalink] New post 29 Dec 2009, 11:07
gr8!..you are right...thanks 4 helping me understand. :)
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Re: V01Q30 [#permalink] New post 21 Feb 2011, 13:07
ichha148 wrote:
I will go with C

C.Butterfly species that respond quickly to changes in temperature hatch caterpillars and undergo metamorphosis into butterflies earlier, flying away before bird species that feed exclusively on them have hatched their young

butterflies will fly away earlier-> no food for species that eat only butterflies -> species will extinct


We are asked to find the answer based on the 'Longer growing season'. Option 'C' is based on 'temperature change', rather than 'Longer growing season'.
Re: V01Q30   [#permalink] 21 Feb 2011, 13:07
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