According to the book, research on identical and fraternal twins has shown that approximately percent of variation in temperament is the result of genetics

The part of the brain that seems to influence emotion is the:

a) thalamus. b) pons. c) amygdala. d) cerebellum.

From studies, young people from their early teens to their late 20s agreed that the most important markers of the transition to adulthood are ____

a. making independent decisions, living independently, and being emotionally stable b. becoming emotionally stable, possessing behavioral control, and having cognitive maturity c. accepting responsibility for oneself, making independent decisions, and becoming financially independent d. possessing cognitive with-it-ness, accepting responsibility for oneself, and living independently