In a study of 39 species, the combined factors of body size and danger accounted for ___ of the variability in sleep time

In Terman's classic study, giftedness was defined as having an IQ score in the top ______ percent

a. 2 c. 10 b. 5 d. 15

Huntington's disease is associated with deficiencies in

a) acetylcholine. b) beta amyloid. c) apolipoprotein E. d) gamma-amino-butyric-acid.