Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1259188132
ISBN 13: 978-1-25918-813-8

Chapter 33 - Animal Diversity and the Evolution of Body Plans - Review Questions - Understand - Page 658: 5

Answer

A.

Work Step by Step

C. is wrong since there is no cavity in that case, and B. is wrong since its cavity has no mesodermal lining. D. is wrong since B. and C. are wrong.
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