If Eric is an average adolescent boy, he will begin his adolescent growth spurt at approximately age

According to research described in the text, about what percent of married people in the U. S. today have sex at least twice a week?

a. 1% b. 20% c. 33% d. 65%

In a study of intelligence,

adopted and biological children reared by the same mother resembled her IQ to the same degree, whether or not they shared her genes. Indicate whether this statement is true or false.