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 - Apply: 1

Answer

D.

Work Step by Step

A.-C. are all correct: both protostomes and deuterostomes have this stage (A.), they shared spiralian cleavage (B.), and this stage does not show reversion/it is determinate (C.). Since A.-C. are correct, D. is the best choice.
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