The life-span range by nation is _____ years

________________ are researchers who study aging and the old

a. Psychologists b. Eschatologists c. Gerontologists d. Ontologists.

An anxiety disorder characterized by frequent panic attacks that affect the person's ability to function in day-to-day living is called ______

a) panic disorder b) obsessive-compulsive disorder c) generalized anxiety disorder d) phobic disorder