Paul is 48 and recently separated from his wife. As he gets back into the dating scene, which STI is Paul most at risk of contracting?

What do getting married, surviving a tornado, and dealing with a long, congested commute to work all have in common?

a. They are all major life events. b. They are all catastrophes. c. They are all daily hassles. d. They are all stressors.

One problem in using a cross-sectional design in developmental research is that

a. sample attrition is likely to occur. b. there may be a cohort effect. c. there may be carryover effects. d. there may be a history effect.