What sexual practice would include sexual relations between a brother and sister?

Autonomous, well-adjusted adolescents are most likely those who

A) disengage from their parents. B) have close and warm relationships with their parents. C) have high levels of conflict with their parents. D) reject their parents' attitudes and beliefs and develop their own.

To find out if using night lights affected the development of nearsightedness, a group of researchers asked parents whether their teen-aged children had slept with night lights on as infants. This research illustrates a

a. retrospective design. b. cohort design. c. cross-sectional design. d. longitudinal design.