Walking on two feet instead of four was a successful adaptation for humans to their environment.
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Q6: Humans evolved in a straight line from
Q7: Homo sapiens is the ancestor of our
Q8: Cro Magnon humans have given us the
Q9: Until the invention of agriculture, humans survived
Q10: Biological and cultural evolution proceeded separately.
Q12: When human mothers began to walk on
Q13: All manner of social processes developed from
Q14: Organization into troops, tribes, and tribal confederations
Q15: The discovery of fire contributed to the
Q16: Human nature and the way of life
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