Biology (11th Edition)

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

Chapter 35 - Deuterostomes - Review Questions - Understand - Page 731: 9

Answer

D.

Work Step by Step

A.-C. are all true for birds, and they help with flying by trapping air well as the wing beats (A.), allowing for vigorous work to beat the wings (B.), and providing plenty of oxygen for that work (C.). Since A.-C. are all true, D. is the best answer.
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