People with panic disorder probably have a genetic or biochemical predisposition toward the disorder. When environmental conditions and cognitive factors combine with this predisposition, the person may show panic disorder. This description describes what model of mental disorders?

When a majority-speaking child is taught a second language, it usually results in

a. additive dyslexia. b. subtractive bilingualism. c. additive bilingualism. d. the child becoming less than fluent in both languages.

The polarization of a neuron results in a resting potential of about –70 millivolts. This is followed by depolarization resulting in an action potential of +110 millivolts. This brings the membrane voltage to

a. + 40 millivolts. c. +180 millivolts. b. - 40 millivolts. d. -180 millivolts.