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The common ancestors of Australian land- and tree-dwelling kangaroos

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Director
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The common ancestors of Australian land- and tree-dwelling kangaroos  [#permalink]

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New post 25 Jul 2017, 08:53
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79% (01:54) correct 21% (02:06) wrong based on 136 sessions

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The common ancestors of Australian land- and tree-dwelling kangaroos had prehensile (grasping) tails and long opposable thumbs, attributes that are well adapted to tree-dwelling but offer kangaroos few advantages on land. It is hardly surprising, therefore, that land-dwelling kangaroos eventually lost these attributes; what is puzzling is the fact that all modern tree-dwelling kangaroos now lack them as well.

Which one of the following, if true, most helps explain the puzzling fact cited above?


(A) Modern tree-dwelling kangaroos must back down tree trunks slowly and carefully, but the common ancestors of modern tree-and land-dwelling kangaroos used their opposable thumbs to descend trees quickly headfirst.

(B) Modern tree-dwelling kangaroos are smaller than most modern land-dwelling kangaroos but larger than their common ancestors.

(C) Modern tree-dwelling kangaroos’ tails cannot grasp branches, but they are somewhat longer and more flexible than those of modern landdwelling kangaroos.

(D) Modern tree-dwelling kangaroos are descended from species of land-dwelling kangaroos that had been land-dwellers for many generations before modern tree-dwelling kangaroos started to develop.

(E) Modern tree-dwelling kangaroos have smaller and weaker hind legs than modern landdwelling kangaroos, and they move more slowly on land than do modern land-dwelling kangaroos.

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Re: The common ancestors of Australian land- and tree-dwelling kangaroos  [#permalink]

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New post 25 Jul 2017, 09:33
D
It explains that the the modern tree dwelling kangaroos have descended from land based kangaroos and hence they do not have those attributes
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Re: The common ancestors of Australian land- and tree-dwelling kangaroos  [#permalink]

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New post 09 Dec 2018, 13:18
Given the explain question, you have to bridge the gap that would explain the phenomena of the prompt:
choice D is the only one that provides a valid reason. The other four are irrelevant to the question.
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Re: The common ancestors of Australian land- and tree-dwelling kangaroos  [#permalink]

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New post 19 Dec 2018, 03:16
D. This statement follows the argument made in the passage that land dwelling kangaroo eventually lost these attributes. Now if modern tree-dwelling kangaroo are descendent of land-dwelling kangaroo, it is obvious that they too won’t have these attributes. Hence, D is the answer.
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Re: The common ancestors of Australian land- and tree-dwelling kangaroos &nbs [#permalink] 19 Dec 2018, 03:16
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The common ancestors of Australian land- and tree-dwelling kangaroos

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