Footprints Preserved in 3

Footprints preserved in 3.6 million-year-old volcanic ash at Laetoli, Tanzania, indicate that

A) some of our early ancestors may have worn crude sandals.
B) A. africanus was on his/her way out of Africa.
C) A. boisei and A. africanus both lived about 3.6 million years ago.
D) A. afarensis was quadripedal.
E) bipedalism definitely preceded marked brain expansion in human evolution.

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