Answer
Continental separation about 45 million years ago caused the separation of the two groups.
Work Step by Step
as above
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 26, Animal Evolution and Diversity - 26.3 - Primate Evolution - 26.3 Assessment - Page 772: 2b
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