Which of the following is NOT one of the "big three" elements of effective fatherhood:

Research indicates the most consistent and prominent difference between males and females is a significant variation in levels of __________

a) mathematical ability. b) spatial ability. c) overall aggression. d) physical aggression.

During adolescence, the brain becomes more efficient and precise in its functioning, partly because of the increase in

A) neurons. B) synapses. C) hemispheres . D) myelin.