Answer
Most multicellular animals developed during the Cambrian explosion (about 500 million years ago).
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 - 26.1 - Invertebrate Evolution and Diversity - 26.1 Assessment - Page 756: 1a
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