A) evolution of bipedalism and the enlargement of the brain
B) making and using tools
C) using fire and making shelters
D) exhibiting culture and having sophisticated tools
Correct Answer: A
Solution :
The two critical steps in the evolution of humans were the evolution of bipedalism (walking on two feet) and the enlargement of the brain. The earliest hominoid and the direct ancestors of humans belong to the genus- Australopithecus.
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