Factors that may limit human brain size include
A) the brain's requirements for calcium.
B) gender differences in brain size.
C) the brain's need for fatty acids.
D) difficulties in childbirth.

Question

Quizplus · Accepted Answer

Difficulties in childbirth may limit human brain size because a larger head size can make childbirth more difficult and dangerous for both the mother and the baby. Therefore, natural selection may have favored smaller brain sizes that could be accommodated by the female pelvis during birth.

Factors That May Limit Human Brain Size Include