Multiple Choice
Compared with the Eocene, the Oligocene was characterized by
A) the rise of a land bridge connecting North and South America.
B) colder, more variable global temperatures.
C) a change in the Northern Hemisphere from deciduous to tropical forests.
D) warmer, more consistent temperatures.
Correct Answer:

Verified
Correct Answer:
Verified
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Q11: The ratio of <sup>16</sup>O to <sup>18</sup>O in
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