Which ancient philosopher believed that people who were mentally ill should be separated from society?

There are approximately ___ light receptors in the human eye

a. 126 million b. 100 billion c. 126 thousand d. 12.6 million

Studies have shown that since 1990, differences between men and women in sexual desire have

a. remained about the same b. become smaller c. become greater d. become greater except for number of sexual partners