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.
Answer: b
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