While the human brain makes up only _____ of the bodys weight, it requires about _____ of the bodys resources when at rest.
a. .75; 8
b. 2; 15
c. 4; 25
d. 7; 30
Question 2
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. The physiological cost of a bigger brain exceeds its benefit.
d. More efficient neuronal connections account for modern human advancements.
The female brain
The grey side-gilled sea slug Pleurobranchaea maculata. The discovery of tetrodotoxin in this slug i
brain
The Oase I mandible, earliest modern human in Europe.
Rat Brain and Skull
Human dihydrofolate reductase complexed with ligands