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 - Page 659: 9



Work Step by Step

B. is wrong because the coelom evolved only once, and C. is incorrect since distantly related animals are found within the coelomates. D. can be eliminated based on the fact that the coelom is lined with mesoderm, not endoderm.
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