Bipedalism, considered a key defining characteristic that differentiated early hominins from other apes,
A. may have evolved as a result of anatomical changes caused by stone tool manufacturing.
B. evolved as a result of anatomical changes caused by an increase in brain size.
C. perhaps developed in the woodlands but became even more adaptive in a savanna habitat.
D. resulted in greater exposure to heat stress because on two feet, hominins spent increasingly more time in the open grasslands.
E. was accompanied by a sharp increase in hominins' climbing abilities.
Answer: C
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