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# Capuchin monkeys often rub their bodies with a certain type

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SVP
Joined: 28 May 2005
Posts: 1705
Location: Dhaka
Capuchin monkeys often rub their bodies with a certain type [#permalink]

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19 Dec 2005, 04:54
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Capuchin monkeys often rub their bodies with a certain type of millipede. Laboratory tests 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 scientistsâ€™ 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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hey ya......

Director
Joined: 17 Dec 2005
Posts: 547
Location: Germany

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19 Dec 2005, 08:44
A) is out because it provides no evidence to the scientist's conclusion

E) Is out of scope

B) Do the capuchins use the millipeds to repel other insects and the repulsion of the mosquitos is just a luck? In fact, this statement can be used as a counterargument to the scientist's conclusion.
However, it doesn't clarify the conclusion. => out

D) Possibly it strengthens the conclusion, but it needn't. Maybe they use the secretions for social reasons.

I think it's C, but it's a hard question for me
SVP
Joined: 16 Oct 2003
Posts: 1801

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19 Dec 2005, 09:02
I think it has to be between C and D and C strenghtens the hypothesis.
Director
Joined: 17 Dec 2005
Posts: 547
Location: Germany

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19 Dec 2005, 09:16
Bhai wrote:
I think it has to be between C and D and C strenghtens the hypothesis.

Yes D is very near, but it actually doesn't state any relation between the millipeds, the mosquitos and the rubbing.

B is better, because

few mosquitos=> no rubbing
many mosquitos=> rubbing

but let's wait for the answer. I don't want to say it definitely
Senior Manager
Joined: 03 Nov 2005
Posts: 384
Location: Chicago, IL

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19 Dec 2005, 12:03
Choice C suggests that rubbing is a natural reflex and, therefore, strengthens a hypothesis.
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Director
Joined: 17 Dec 2005
Posts: 547
Location: Germany

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19 Dec 2005, 12:14
rlevochkin wrote:
Choice C suggests that rubbing is a natural reflex and, therefore, strengthens a hypothesis.

Isn't it?
Director
Joined: 09 Jul 2005
Posts: 591

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19 Dec 2005, 12:22
C makes the most sense among all the possible answers.
Senior Manager
Joined: 03 Nov 2005
Posts: 384
Location: Chicago, IL

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19 Dec 2005, 12:59
rlevochkin wrote:
Choice C suggests that rubbing is a natural reflex and, therefore, strengthens a hypothesis.

Isn't it?

I'm sorry, allabout, I will be more precise on that. Capuchin monkeys' rubbing is a natural reflex triggerred by the excessive population of mosquitos. Does it make a bit more sense to you now. Hope so.
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Hard work is the main determinant of success

Director
Joined: 26 Sep 2005
Posts: 572
Location: Munich,Germany

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19 Dec 2005, 23:06
C here.
VP
Joined: 06 Jun 2004
Posts: 1053
Location: CA

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20 Dec 2005, 01:18
clear C
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Manager
Joined: 23 Apr 2005
Posts: 206

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21 Dec 2005, 09:28
C is my choice.
Current Student
Joined: 23 Oct 2005
Posts: 243
Schools: Cranfield SOM
Re: CR # Capuchin monkeys [#permalink]

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21 Dec 2005, 10:48
nakib77 wrote:
Capuchin monkeys often rub their bodies with a certain type of millipede. Laboratory tests 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 scientistsâ€™ 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.

Between c & D I choose C.
SVP
Joined: 28 May 2005
Posts: 1705
Location: Dhaka

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21 Dec 2005, 10:55
I also picked C.

but OA is E. doesn't make any sense at all. I think OA is incorrect.
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SVP
Joined: 16 Oct 2003
Posts: 1801

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21 Dec 2005, 13:34
nakib77 wrote:
I also picked C.

but OA is E. doesn't make any sense at all. I think OA is incorrect.

What????????????????????????????????
VP
Joined: 30 Sep 2004
Posts: 1480
Location: Germany

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21 Dec 2005, 13:43
OA is definitely incorrect ! it must be C) !
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Director
Joined: 17 Dec 2005
Posts: 547
Location: Germany

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21 Dec 2005, 14:41
E is out, we agree with that.
Director
Joined: 23 Jun 2005
Posts: 841
GMAT 1: 740 Q48 V42

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21 Dec 2005, 21:41
Yep, I had a certain C down for this one!
21 Dec 2005, 21:41
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# Capuchin monkeys often rub their bodies with a certain type

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