Given the need for brain stimulation, research has shown that which of the following spends more time in REM sleep?

_____ studies observe different individuals at different ages at a single point in time to track age differences

A) Sectional B) Cross-sequential C) Sequential D) Cross-sectional

According to the theory about the impact of the social clock of adult life events, which of the following individual patterns is associated with the most upheaval or disruption or personal difficulty—at least for current cohorts?

a. having your parents both die when you are in your 20s b. having a first child at age 30 c. receiving your last work promotion at age 40 d. retiring at age 65