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Which of the following best completes the passage below? [#permalink]
26 Mar 2005, 08:00
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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€
I'll go for B since it is the most conservative answer directly answering the experiment of "lepidopterists [who] plan to install a low-voltage transmitter..."
D and E are too aggressive claims and nothing can warrant what those two conclude _________________
I guess I don't get this OA....butterflies sensitive to electricity ?? were we giving shocks to the butterflies I thot we were transmitting em waves thro transmitters.
The only link we can make is to the part which mentions the low-voltage transmitter. Hence, the only logical and most conservative flow would be that as a result of that test, butterflies are sensitive to electricity. The original test has NO CORRELATION whatsoever with electromagnetic fields although it is what another test might try to prove. _________________
That's correct...and that is exactly the mistake I made...I never thought the answer can be B...but the key here is "As a first step" ....which means the experiment on butterflies might not be, in any way, related to EM waves