From anthropological studies, about ____ of cultures have some kind of explicit economic transaction as a part of the marriage process

Size constancy explains why ______

a. objects are perceived as having constant dimensions regardless of distance b. perception of size is inversely related to distance c. closer objects are perceived as smaller than far-away objects d. distance affects perceived size

Treatment for children with attention-deficit hyperactivity disorder usually involves

a. behavioral therapy. c. changes in diet (no sugar). b. psychotherapy. d. drug therapy.