Which type of research study is a compromise technique that essentially examines a number of different age groups at several points in time, and permits developmental researchers to tease out the consequences of age change versus age difference?

Each of the following is a prenatal stage of development EXCEPT:

a) the perinatal stage. b) the germinal stage. c) the embryonic stage. d) the fetal stage.

In the United States what age group has the highest rates of automobile accidents, injuries, and fatalities of any age group?

16 to 24 years 18 to 28 years 20 to 30 years 22 to 32 years