Closure, nearness, similarity, and continuation are categories of

A woodchuck tries to crack a walnut shell in two different ways--with his paws and with his teeth. The last method worked and the first did not; hence, the woodchuck will be more likely to rely on his teeth for splitting the next nut

This observation illustrates the: a. the discrimination principle. b. the law of practice. c. the law of effect. d. the Premack principle.

The arching of the back exhibited by a female rat during copulation is known as:

a. lordosis b. receptivity c. pronation d. attractiveness