The fossil record shows that the climate of North America : GMAT Critical Reasoning (CR)
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The fossil record shows that the climate of North America

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The fossil record shows that the climate of North America [#permalink]

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07 Apr 2004, 05:57
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The fossil record shows that the climate of North
America warmed and dried at the end of the Pleis-
tocene period. Most of the species of large mammals
then living on the continent became extinct, but the
smaller mammalian species survived.

Which of the following, if true, provides the best
basis for an explanation of the contrast described
above between species of large mammals and species
of small mammals?
(A) Individual large mammals can, in general, travel
further than small mammals and so are more
able to migrate in search of a hospitable
environment.
(B) The same pattern of comparative success in
smaller, as opposed to larger, species that is
observed in mammals is also found in bird
species of the same period.
(C) The fossil record from the end of Pleis-
tocene period is as clear for small mammals
as it is for large mammals.
(D) Larger mammals have greater food and space
requirements than smaller mammals and are
thus less able to withstand environmental
change.
(E) Many more of the species of larger mammals
than of the species of smaller mammals living
in North America in that period had origi-
nated in climates that were warmer than was
that of North America before the end of the
Pleistocene period
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The fossil record shows that the climate of North America   [#permalink] 07 Apr 2004, 05:57
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The fossil record shows that the climate of North America

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