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: 4



Work Step by Step

Option A is incorrect. Sponges are not chordates. Option C is incorrect. Fishes are vertebrate chordates. If options A and C are incorrect, that means option D is also incorrect. Option B is correct. Only two types of chordates are nonvertebrates, meaning they do not possess backbones. These two chordates are tunicates and lancelets.
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