What is the most important difference between Australopithecus afarensis and the modern apes?
A. Au. afarensis had increased cranial capacity.
B. Au. afarensis had lost its prehensile tail.
C. Au. afarensis had better color vision than apes.
D. Au. afarensis was bipedal.
E. Au. afarensis had a narrow chest, whereas living apes have a barrel chest.
Answer: D
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