Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 33 - Animal Diversity and the Evolution of Body Plans - Review Questions - Synthesize: 2

Answer

Based on their radial symmetry and lack of a complete gut, the Echinodermata might be placed in or near the basal eumetazoans such as the Cnidarians.

Work Step by Step

This shows why we use multiple traits, especially embryonic development, to decipher the history of life. Any one trait can be misleading on its own. Embryonic development is especially useful in seeing connections between organisms since it comes early in the life of an organism when less time has occurred for misleading morphological differences to have formed.
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