According to the text, symptoms of _____ include fatigue, irritability, and difficulty sustaining attention

People are to __________ selection as nature is to __________ selection

a. regressive; progressive b. environmental; genetic c. artificial; natural d. supportive; adaptive

Cohabitation is the "first union" for _____ of American women

a. one-fourth b. one-third c. over half d. two-thirds