Incentive theory states that motivation is a way to ______.

Rob finds his brother's low spirits depressing, but he proposes a game they both like and soon both are in a better mood. This is an example of a

A) positive feedback loop. B) negative feedback loop. C) phase transition. D) disequilibrium.

Children's conversational fluency approaches that of most adults by

a. 4 years old. b. 6 years old. c. 9 years old. d. 12 years old.