Question

Why is it thought that advances such as agriculture, literacy, and urbanization have not been accompanied by additional increases in brain size?
a. ?the earliest homo sapiens were as intelligent as contemporary humans.
b. ?although brain size has remained constant, brain density has increased.
c. ?more efficient neuronal connections account for modern human advancements.
d. ?the physiological cost of a bigger brain exceeds its benefit?

Answer 1

I think the best answer is D. It is thought  that advances such as agriculture, literacy, and urbanization have not been accompanied by additional increases in brain size because the physiological cost of a bigger brain exceeds its benefit. The brain requires a lot of nutrients to function. Having a bigger brain would cost a lot rather than benefiting from it.