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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Which of the following best completes the passage below? [#permalink]

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18 Aug 2006, 03:43
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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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18 Aug 2006, 03:57
(D) seems like the best choice here. This is exactly what the lepidopterists set out to prove in the premise of the of passage.

From Wikipedia: ---> A lepidopterist is a person who catches and collects, or simply studies, lepidopterans, members of an order comprising butterflies, skippers, and moths.

Last edited by GMATT73 on 18 Aug 2006, 06:42, edited 1 time in total.
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18 Aug 2006, 05:37
It should be (B). All that the experiment proves is that the butterflies are sensitive to electricity.
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18 Aug 2006, 05:52
sperinko wrote:
It should be (B). All that the experiment proves is that the butterflies are sensitive to electricity.

Why not C....
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18 Aug 2006, 06:16
sumitsarkar82 wrote:
sperinko wrote:
It should be (B). All that the experiment proves is that the butterflies are sensitive to electricity.

Why not C....

Must be B

Though I also chose C first but now I can see that C is wrong.
(B) monarch butterflies are sensitive to electricity
(C) low-voltage electricity can affect butterflies, whether positively or adversely

C is talking about butterflies in general but argument is talking about monarch butterflies.
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18 Aug 2006, 07:18
B it is..

The conclusion should be based on monarch butterflies.

Although the statement in C is correct it is not the conclusion that the lepidopterists look forward to make. Lepidopterists is more interested in monarch butterflies (they started the experiment to test the Monarch Butterflies theory) and hence they would make the conclusion that Monarch butterflies are sensitive to electricity.
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18 Aug 2006, 08:42
B it is ...
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20 Aug 2006, 23:39
OA is B
20 Aug 2006, 23:39
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