Answer
D.
Work Step by Step
A.-C. are wrong since they can be found in animals without bilateral symmetry or heads (cephalization), but D. was possible once a polar body with bilateral symmetry existed.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
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: 4
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