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 - Understand: 13

Answer

D.

Work Step by Step

A. is wrong because there are many kinds of flattened "worms" which are not closely related, and B. can be eliminated since the "acoel" is not an evolved structure but an ancestral lack of a cavity. C. is incorrect since acoels are eumetazoans, not parazoans.
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