Same-sex attraction is unique to mammals.”

,”2. Working with Walter Cannon, A. L. Washburn swallowed a balloon that was inflated to fill his stomach to show that feelings of hunger are accompanied by

has been standardized on a representative sample of all those who are likely to take the test.”

multiple array of completely independent adaptive traits.”

about 80 percent effective; of limited protective value

school smarts are the key to success.

Researchers have been unable to pin down specific environmental factors that influence sexual orientation.

of limited protective value; about 80 percent effective”

produces a normal distribution of scores.

of limited protective value; of limited protective value