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 2
Agriculture, urbanization, and literacy appear to have produced _________ in human brain size.
a. large amounts of additional growth
b. modest amounts of additional growth
c. no apparent changes
d. possible reductions