Answer
A.
Work Step by Step
The choanocyte (A.) uses its flagellum to create the flow of water which allows the sponge to feed. B. forms the middle part of the sponge body, while C. covers the outside and D. provides skeletal support.
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: 11
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