Answer
Bipedalism to be able to survey grass-land environment for possible dangers and food; bigger brains that developed due the skeleton and muscle changes to adapt to bipedalism.
Work Step by Step
1.4. Section „Walking upright“
Anatomy & Physiology: The Unity of Form and Function, 7th Edition
by Saladin, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073403717
ISBN 13:
978-0-07340-371-7
Chapter 1 - Section 1.4 - Human Origins and Adaptations - Before You Go On - Page 11: 11
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