Bipedal behavior and a skeleton adapted for

bipedalism were not weeded out by natural
selection because they
a. improved stability during locomotion.
b. enabled the forelimbs to efficiently
manipulate the environment.
c. accelerated the development of binocular
vision.
d. improved stability during locomotion and
enabled the forelimbs to efficiently
manipulate the environment.
e. improved stability during locomotion,
enabled the forelimbs to efficiently
manipulate the environment, and
accelerated the development of binocular
vision.


B

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