The earliest hominid fossil, “Lucy," is estimated to be 3.2 million years old. This early
human-like species shares an important characteristic with modern humans: bipedalism.
Which of the following would favor the selection of bipedal posture over walking on all
fours?
Bipedal posture allowed for greater mobility in the tree canopy.
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Bipedal posture allowed arms to be free to develop and use tools.
Bipedal posture allowed for an increase in hominid brain and jaw size.
Bipedal posture allowed a greater number of offspring to be produced in
hominids.