What is the term that Piaget used for the process in which one state is changed into another?

The major reason for the lack of exercise among adolescents is that

A) they lack opportunities. B) most adolescents do not like organized sports. C) most do not make sports teams. D) they spend time watching television and other sedentary activities.

In order to prevent STDs, the textbook mentions all of the following EXCEPT

a. Take vitamin supplements, especially B-12 supplements. b. Inspect your partner's sex organs before sexual contact. c. Abstain from sexual contact if you have doubts about potential harmful effects. d. Use latex condoms since "natural" condoms provide less protection. e. Get regular medical check-ups to detect disorders you may not be aware of.