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Capuchin monkeys often rub their bodies with a certain type

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Capuchin monkeys often rub their bodies with a certain type [#permalink] New post 17 Jun 2007, 07:58
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A
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D
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Capuchin monkeys often rub their bodies with a certain type of millipede. Laboratorytests show that secretions from the bodies of these millipedes are rich in two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins. Some scientists hypothesize that the monkeys rub their bodies with the millipedes because doing so helps protect them from mosquitoes.

Which of the following, if true, provides the most support for the scientists’ hypothesis?

A. A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it.
B The two chemicals that repel mosquitoes also repel several other varieties of insects.
C. The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at their peak.
D. Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub their bodies.
E. The two insect-repelling chemicals in the secretions of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins
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 [#permalink] New post 17 Jun 2007, 08:55
C.
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 [#permalink] New post 17 Jun 2007, 09:00
Obviously C
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 [#permalink] New post 18 Jun 2007, 06:50
I go for B.

Please explain why C is so obvious too you?

I think there is more support coming from the fact that the two substances are insect repellers rather then the link between rainseason and presence of insects.
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 [#permalink] New post 18 Jun 2007, 07:36
ronron wrote:
I go for B.

Please explain why C is so obvious too you?

I think there is more support coming from the fact that the two substances are insect repellers rather then the link between rainseason and presence of insects.


We want something that will strengthen the hypothesis that monkeys are rubbing the milipedes mainly to prevent mosquito bites, answers A, B, D & E do not link mosquitoes with monkey's milipede usage. Whereas C shows monkeys rarely rub milipedes on their bodies but do so during peak mosquito season, thus drawing a relation between mosquitos and their milipede rubbing activity, strengthening the scientists' hypothesis.

Therefore, the answer is a clear C.
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 [#permalink] New post 18 Jun 2007, 16:48
C.
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Re: CR --->Capuchin Monkeys [#permalink] New post 18 Jun 2007, 17:13
abhinava wrote:
Capuchin monkeys often rub their bodies with a certain type of millipede. Laboratorytests show that secretions from the bodies of these millipedes are rich in two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins. Some scientists hypothesize that the monkeys rub their bodies with the millipedes because doing so helps protect them from mosquitoes.

Which of the following, if true, provides the most support for the scientists’ hypothesis?

A. A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it.
B The two chemicals that repel mosquitoes also repel several other varieties of insects.
C. The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at their peak.
D. Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub their bodies.
E. The two insect-repelling chemicals in the secretions of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins



This is how I thought

A - ruled out (irrelevant)
B - several other varieties of insects (ruled out because we only need to focus on mosquitoes)
C - "rarely". The passage clearly states "often rub". So according to me, ruled out
E - ruled out (irrelevant)

I believe "D" is the best choice because "Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub their bodies BECAUSE doing so helps protect them from mosquitoes.
Re: CR --->Capuchin Monkeys   [#permalink] 18 Jun 2007, 17:13
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