Modern humans have lost the system of air sacs that other great apes have.Whatever the reason for this loss,one resulting effect on human behavior was ________.
A) restriction of modern humans to low altitudes
B) loss of the ability to make loud calls
C) improved ability to swallow
D) increase in the sizes of Broca's and Wernecke's areas
E) the ability to pronounce sounds more clearly
Correct Answer:
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