People who _____ have been found to be far less likely to develop memory problems in old age.

Puberty begins

Adolescence refers to the period between

The impulsive and often risky behavior that can be seen during adolescence is partially the result of

Generally speaking, people experience the peak of their physical functioning during their

A(n) _____ is a requirement of some substance, such as food or water, that is essential for survival of the organism.

_____ refers to the psychological tension and physical arousal created when there is a need that motivates the organism to act in order to fulfill the need and reduce the tension.

Chad and Jeremy decide to train together to participate in a triathlon. Jeremy is doing it because he likes the challenge, but Chad is only doing it because he wants to win the prize money. Chad is being motivated by a(n) _____ drive.

Louiche goes for a three-mile run, causing him to sweat and become thirsty. In response to this need, Louiche drinks a bottle of water. When he drinks, he restores his body's