Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 26, Animal Evolution and Diversity - Assessment - 26.1 Invertebrate Evolution and Diversity - Understand Key Concepts/Think Critically - Page 776: 1

Answer

b.

Work Step by Step

During the Cambrian, there appeared an explosion in features such as cephalization, segmentation, symmetry of body plan, and coelom formation. By the time the Cambrian Period ended, all basic body plans of all modern phyla of animals had already appeared.
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