Answer
D
Work Step by Step
Cnidaria is a phylum of around 10,000 species, including the hydra. They are the first organisms to possess muscles, nerves and a stomach. They have very simple central nervous systems, unlike bilaterians.
Biological Science (6th Edition)
by Freeman, Scott; Quillin, Kim; Allison, Lizabeth; Black, Michael; Taylor, Emily; Podgorski, Greg; Carmichael Jeff
Published by
Benjamin Cummings
ISBN 10:
0321976495
ISBN 13:
978-0-32197-649-9
Chapter 30 - An Introduction to Animals - Review - Page 633: 4
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