Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 26 - Self-Quiz - Page 446: 3

Answer

c. bipedalism

Work Step by Step

Apes who walk on their knuckles have C-shaped backbones, which allows them to hunch over and lean on their knuckles; humans have S-shaped backbones that allow their heads to sit directly over their feet so they can walk upright.
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