Two forms of electronic communication are

Using the Premack principle, once you have finished studying for your next biology test you should

a. not study for at least two hours. b. study for a different test. c. work on your biology homework assignment. d. teach the biology material to a friend or classmate. e. do something you enjoy.

Martin is suffering from HIV-associated cognitive disorder. Until his condition is accurately diagnosed, Martin's symptoms may be confused with

a) delirium tremens. b) major depression. c) personality disorder. d) post-traumatic stress disorder.