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The mastodon, a large mammal resembling today's elephant, [#permalink]
 18 Jun 2010, 11:20
Question Stats:
38% (02:22) correct
61% (01:26) wrong based on 1 sessions
The mastodon, a large mammal resembling today's elephant, became extinct at the end of the Ice Age. Scientists once attributed the mastodon's extinction to the disappearance of evergreen forests at the end of the Ice Age. More recently, however, scientists have rejected that theory, hypothesizing instead that the mastodon's extinction was caused by the draining of glacial wetlands. Which of the following, if recently discovered, would help to account for the change in the accepted explanation of the mastodon's extinction? (A) When the Ice Age ended, many forests died off, endangering the food supply for herbivores that fed primarily on evergreens. (B) As glaciers receded at the end of the Ice Age, glacial wetlands drained, leaving a new topography of hills and plains. (C) Bacteria found in mastodon remains are similar to bacteria found in the remains of species that are known to have fed on evergreens. (D) The mastodon's diet consisted primarily of water plants such as marsh grasses and water lilies. (E) Evergreen forests were inhabited by many species of large mammals until the end of the Ice Age.
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D, since draining of the glacial wetlands would lead to decreased food supply for the mastodon.
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thanks. why isn't B ? Pls elaborate. ariel wrote: D, since draining of the glacial wetlands would lead to decreased food supply for the mastodon.
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It cannot be B because it does does give a relationship between the drained glacial wetlands and mastodon, we are not suppossed to assume anything, D is more elaborate and logical.
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we are not suppossed to assume anything -----> I didn't get the point. Pls elaborate. There are 2 theories here. And the answer will weaken the first and strengthen the latter. ParvezDhamani wrote: It cannot be B because it does does give a relationship between the drained glacial wetlands and mastodon, we are not suppossed to assume anything, D is more elaborate and logical.
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hmm.B!
disappearance of evergreen forests could be one possible effect of new topology caused by the draining of glacial wetlands
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A GMAX tip! When answering a strengthening or assumption question, identify the single sentence that is the conclusion, in your head, add the word 'because', and then read the answer choice. The resulting sentence should flow logically.Try this with answer choice B, and you should 'hear' the problem: "The disappearance of wetlands caused the mastodon's extinction because the draining of the glacial wetlands left a new topography." You still have to explain why topography caused the extinction of the mastodons. Now 'listen' to D: "The disappearance of the wetlands caused the mastodon's extinction because the mastodons fed on wetland plants." The sentence makes explicit the mastodon's reliance on the wetlands. If you have to add an extra explanation in your head to make the sentence make sense, then there's a problem.
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Gotcha ! SaraiGMAXonline wrote: "The disappearance of wetlands caused the mastodon's extinction because the draining of the glacial wetlands left a new topography." You still have to explain why topography caused the extinction of the mastodons.
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D it is.
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Good explanation SaraiGMAXonline  Nice method to double check strengthen question and fish out last of the contenders.
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glad I picked D
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