Answer
Fossils of most of the animals before the Cambrian period cannot be found due to their very small and soft bodies.
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: 1c
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