Answer
B.
Work Step by Step
A. is wrong because it is the (often) free-swimming stage, and C. is the stage which is affixed to the substrate. D. is a cell type, not even an entire lifecycle stage, and, so, is wrong.
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 659: 12
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