Food sources with high protein levels are often more difficult to procure. It is difficult for mothers to give birth to large-brained children. A biological means of addressing this problem is that development of the human brain was retarded until after birth. Thus, humans could be born with small heads and brains would grow after birth. This leads to new patterns of maturation.
Humans mature very slowly in comparison with other species.
Humans, of course, can learn throughout a lifetime. You should focus your attention on cultural solutions rather than biological ones. Conclude your assignment with a paragraph that links this discussion on large brains to the definition of culture that you developed in your previous assignment.