Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 33 - Animal Diversity and the Evolution of Body Plans - Review Questions - Understand: 2

Answer

B.

Work Step by Step

Tissues help define animals, especially muscle and nerve (B.), not organs made of these, which not all animals have (A., C.). D. is wrong since many organisms have flagella, not just animals.
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