__________ measure(s) the extent to which individual differences in complex traits in a specific population are due to genetic factors

The "behavior" that is incompatible with anxiety, and that systematic desensitization tries to recondition to phobic cues, is

a. an imagined fear. b. an imagined pleasant experience. c. deep muscle relaxation. d. vigorous exercise.

Longitudinal and/or cross-sectional research is often necessary to determine

A. how disorders change and progress over a typical patient's lifetime. B. the genetic causes of a particular disorder. C. the environmental causes of a particular disorder. D. the biological causes of a particular disorder.