Developed countries have the smallest relative proportion of obese citizens

In their use of operant conditioning techniques to train animals from many species to perform various behaviors, the Brelands described instances of animal "misbehavior." They attributed this misbehavior to the

a. spontaneous recovery of extinguished behaviors. b. use of punishment rather than reinforcement. c. tendency for learned behavior to drift toward instinctual behavior. d. use of shaping by successive approximations.

___ means that genes contribute a predisposition for a disorder that may or may not exceed the threshold to produce the disorder

a. Heritability b. Heritability quotient c. Concordance rate d. Vulnerability