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: 12



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.
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