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The common ancestors of Australian land- and . . .

This topic has 0 member replies

The common ancestors of Australian land- and . . .

Post Fri Sep 15, 2017 7:44 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    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.

    The OA is D.

    Why D is the option which most helps explain the puzzling fact?

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