Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1259188132
ISBN 13: 978-1-25918-813-8

Chapter 46 - The Musculoskeletal System - Review Questions - Understand - Page 981: 1

Answer

D.

Work Step by Step

A. is wrong since endoskeletons are often rigid, and B. is incorrect since endoskeletons can be found outside the vertebrates, as in the sponges. C. can be eliminated since it reverses the chemical makeup of the two kinds of skeletons.
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