Mary Leakey's 1970s discovery of fossilized human footprints in Laetoli, Tanzania revealed that
A. hominids did not exist in Africa until 500 BC.
B. hominids walked upright over 3.5 million years ago.
C. hominids lived in complex civilizations.
D. hominids first existed in North America, not Africa.

Question

Mary Leakey's 1970s discovery of fossilized human footprints in Laetoli, Tanzania revealed that
	A.	hominids did not exist in Africa until 500 BC.
	B.	hominids walked upright over 3.5 million years ago.
	C.	hominids lived in complex civilizations.
	D.	hominids first existed in North America, not Africa.

anonymous · Answer

B.	hominids walked upright over 3.5 million years ago.