What did physicians in the mid-1800s refer to as "God's own medicine"?

B. F. Skinner is known for his theory of:

a. cognitive learning. b. intelligence. c. classical conditioning. d. operant conditioning.

From studies of young people from their early teens to their late twenties, which of the following is the second most important marker of the transition to adulthood?

a. possessing emotional stability b. accepting responsibility for oneself c. becoming financially independent d. making independent decisions