The sub-concept of death most closely related to the recognition that "all living things must eventually die" is

Elsie, a third-grade student, is asked to define the equal sign. She is likely to say that it means "___."

a. the total sum b. the two sides of an equation represent the same quantity c. equal to d. the same as

A long-distance truck driver who abuses a drug in order to stay awake for long hours would probably be an abuser of

a. PCP. b. amphetamines. c. benzodiazepines. d. GHB.