During early adolescence, _____ gain more body fat and _____ gain more muscle

Which of the following is an example of the fetus' active participation in its own development?

a. fetal alcohol syndrome b. hormonal influence on development of sex organs c. placental defense against toxins and infections d. cephalocaudal development

Participation in voluntary activities

A) rises in early adulthood, as people are raising families. B) declines in middle adulthood with increasing career responsibilities. C) peaks in high school and college, reflecting the wide range of extracurricular activities that are available. D) is higher in childhood immediately before the transition to adolescence.