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Upon maturity, monarch butterflies travel hundreds of miles

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Upon maturity, monarch butterflies travel hundreds of miles [#permalink] New post 01 Mar 2017, 02:13
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66% (00:52) correct 33% (02:23) wrong based on 6 sessions


Upon maturity, monarch butterflies travel hundreds of miles from their places of origin and lay their eggs on milkweed. The caterpillars that emerge feed on milkweed and absorb the glycosides in milkweed sap. The specific glycosides present in milkweed differ from region to region within the monarch butterfly's range. Mature butterflies retain the glycosides they absorb as caterpillars. Clearly, therefore, the glycosides in a mature monarch butterfly could be used to determine its place of origin.

Which of the following, if true, most strengthens the argument?

A) Mature monarch butterflies do not feed on parts of milkweed that contain glycosides.
B) The glycosides in milkweed sap are slightly toxic to caterpillars of other species.
C) The vast majority of the monarch butterflies that are laying eggs in a given region will have traveled there from a single region.
D) There are substances other than glycosides in milkweed sap that accumulate in a monarch caterpillar and are retained in the body of the mature butterfly.
E) There are certain glycosides that are found in the sap of all milkweeds, no matter where they grow within the monarch butterfly's range.
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Re: Upon maturity, monarch butterflies travel hundreds of miles [#permalink] New post 01 Mar 2017, 07:46
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Re: Upon maturity, monarch butterflies travel hundreds of miles [#permalink] New post 02 Mar 2017, 02:28
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This is a question that you can reach by POE

A) Mature monarch butterflies do not feed on parts of milkweed that contain glycosides.

This is the best. The key sentence in the stem is this

Quote:
Mature butterflies retain the glycosides they absorb as caterpillars
Which means that mature butterflies once were caterpillar. They absorbed a certain compound, then when they become adult, migrate to another region still maintaining the original glycoside. Then they lay their eggs and the process starts over again. Therefore, the MATURE butteflies DO NOT feed when reach the new place to lay the eggs. They have the glucosides from the origin.

B) The glycosides in milkweed sap are slightly toxic to caterpillars of other species.

This kind of information is superfluous. What the specific compound does to other species is irrelevant

C) The vast majority of the monarch butterflies that are laying eggs in a given region will have traveled there from a single region.

This is also irrelevant to reinforce our conclusion.


D) There are substances other than glycosides in milkweed sap that accumulate in a monarch caterpillar and are retained in the body of the mature butterfly.

Other than substances we do not need to address why or else

E) There are certain glycosides that are found in the sap of all milkweeds, no matter where they grow within the monarch butterfly's range.

Certain compound that we find i certain sap is irrelevant
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Re: Upon maturity, monarch butterflies travel hundreds of miles [#permalink] New post 30 Jun 2017, 02:06
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Here, one should mostly concentrate on the last 2 sentences, which are filling each other. Since, the main argument is that the mature monarch butterfly can be fould via glycosides, one should also read the sentence before the argument, which states that they retain the glycosides they used when they were caterpillars. Therefore, the only applicable answer is the answer A. Others are just out of scope, because they do not have any connection with the argument.
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Re: Upon maturity, monarch butterflies travel hundreds of miles   [#permalink] 30 Jun 2017, 02:06
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Upon maturity, monarch butterflies travel hundreds of miles

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