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# Which of the following best completes the passage below?

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Intern
Joined: 13 Sep 2010
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Which of the following best completes the passage below? [#permalink]

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04 Jun 2011, 01:42
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Difficulty:

95% (hard)

Question Stats:

36% (02:05) correct 64% (01:36) wrong based on 39 sessions

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Which of the following best completes the passage below?
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______
(A) monarch butterflies have brains, however minuscule
(B) monarch butterflies are sensitive to electricity
(C) low-voltage electricity can affect butterflies, whether positively or adversely
(D) monarchs map their routes according to the earth’s electromagnetic fields
(E) monarchs communicate in intergenerationally via electromagnetic fields
[Reveal] Spoiler: OA
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Re: Monarch butterflies - Can someone explain why C is wrong [#permalink]

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04 Jun 2011, 17:59
C is wrong because it is too general. The experiment is designed to only test monarch butterflies, not butterflies in general. That is a significant different.
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J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$. GMAT Club Premium Membership - big benefits and savings Intern Joined: 13 May 2011 Posts: 2 Followers: 0 Kudos [?]: 0 [0], given: 0 Re: Monarch butterflies - Can someone explain why C is wrong [#permalink] ### Show Tags 04 Jun 2011, 19:27 Can someone explain y answer cant be D? Manager Joined: 06 Feb 2011 Posts: 60 Followers: 0 Kudos [?]: 16 [0], given: 1 Re: Monarch butterflies - Can someone explain why C is wrong [#permalink] ### Show Tags 05 Jun 2011, 04:34 anjalipai wrote: Can someone explain y answer cant be D? bcoz its already stated in the argument... We need a conclusion to the argument and only option B gives us the answer.. Need to remember that answer for the conclusion questions needs to stick very closely with the premises.... SVP Joined: 30 Apr 2008 Posts: 1888 Location: Oklahoma City Schools: Hard Knocks Followers: 41 Kudos [?]: 558 [0], given: 32 Re: Monarch butterflies - Can someone explain why C is wrong [#permalink] ### Show Tags 05 Jun 2011, 13:32 anjalipai wrote: Can someone explain y answer cant be D? The experiment only goes to electricity. A low voltage transmitter doesn't mean magnetic, it just means low voltage or power. D is a leap past what the experiment actually tests. _________________ ------------------------------------ J Allen Morris **I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

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Re: Monarch butterflies - Can someone explain why C is wrong [#permalink]

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05 Jun 2011, 23:49
D actually restates the conclusion which has already been theorized.

B it is which follows from the argument itself.
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Re: Monarch butterflies - Can someone explain why C is wrong [#permalink]

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06 Jun 2011, 10:19
Great! Thanks very much for the help!
Re: Monarch butterflies - Can someone explain why C is wrong   [#permalink] 06 Jun 2011, 10:19
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