Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 26, Animal Evolution and Diversity - Standardized Test Prep - Page 779: 3



Work Step by Step

Option B is incorrect. Jellyfish are the simplest animals exhibiting body symmetry. Option C is incorrect. Worms have bilateral symmetry. Option D is incorrect. Arthropods have bilateral symmetry. Option A is correct. Sponges are the simplest animals; they have no body symmetry at all.
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