Answer
a.
Work Step by Step
The hydrostatic skeleton of cnidarians allow them to move; it consists of a chamber filled with fluid. When muscles act against this chamber, this action redistributes the fluid and causes movement.
Biology: The Unity and Diversity of Life (14th Edition)
by Starr, Cecie; Taggart, Ralph; Evers, Christine; Starr, Lisa
Published by
Brooks/Cole Publishing Co.
ISBN 10:
1305073959
ISBN 13:
978-1-30507-395-1
Chapter 24 - Self-Quiz - Page 413: 5
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