One method of dating the emergence of species is to compare : GMAT Critical Reasoning (CR)
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# One method of dating the emergence of species is to compare

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One method of dating the emergence of species is to compare [#permalink]

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23 Jan 2006, 17:11
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One method of dating the emergence of species is to compare the genetic material of related species. Scientists theorize that the more genetically similar two species are to each other, the more recently they diverged from a common ancestor. After comparing genetic material from giant pandas, red pandas, raccoons, coatis, and all seven bear species, scientists concluded that bears and raccoons diverged 30 to 50 million years ago. They further concluded that red pandas separated from the ancestor of todayâ€™s raccoons and coatis a few million years later, some 10 million years before giant pandas diverged from the other bears.
Which one of the following can be properly inferred from the passage?

(A) Giant pandas and red pandas are more closely related than scientists originally thought they were.
(B) Scientists now count the giant panda as the eighth species of bear.
(C) It is possible to determine, within a margin of just a few years, the timing of divergence of various species.
(D) Scientists have found that giant pandas are more similar genetically to bears than to raccoons.
(E) There is substantial consensus among scientists that giant pandas and red pandas are equally related to raccoons.
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Director
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23 Jan 2006, 17:47
D for me..
The chart looks like this
Bears Raccoons
| |
Giant Pandas Red Pandas
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23 Jan 2006, 17:58
Is it D?

Drawing a timeline chart should make it clear that Bears and Pandas diverged most recently. Hence Giant Pandas are more genetically similar to Bears than Racoons
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23 Jan 2006, 17:59
Hewww! Quite a maze. In the end, D should be it. But this CR is quite different in style from most CR from OG....
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23 Jan 2006, 19:59
Yeah D it is..
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23 Jan 2006, 21:22
it is D coz the inference from - One method of dating the emergence of species is to compare the genetic material of related species. ...... some 10 million years before giant pandas diverged from the other bears.

optionsD -Scientists have found that giant pandas are more similar genetically to bears than to raccoons
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23 Jan 2006, 22:25
D. Bingo.
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24 Jan 2006, 12:42
u guys are geniuses. It is D
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25 Jan 2006, 21:10
(D) for
25 Jan 2006, 21:10
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