Which of the following best completes the passage below? : GMAT Critical Reasoning (CR)
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# Which of the following best completes the passage below?

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Manager
Joined: 22 May 2005
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Which of the following best completes the passage below? [#permalink]

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14 Jul 2005, 13:52
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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 earthâ€™s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of â€œbutterfly treesâ€
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Director
Joined: 11 Mar 2005
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14 Jul 2005, 17:00
B for this
Director
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14 Jul 2005, 18:00
The punch line is " As a first step...." so the case that the Butterflies are mapping e.magnetically is not yet established.

B for this
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15 Jul 2005, 09:58
Picked B.

HMTG.
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19 Jul 2005, 07:53
Yet another vote for B.

A is irrelevant.
D and E are wrong, as we are concerned about the results of an experiment with low voltage emitters.

C - The argument is not concerned whether butterflies are affected positively or negatively by low voltage electricity.

Definitely B, if the scientists can prove that butterflies are sensitive to electricity then their theory holds.
19 Jul 2005, 07:53
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