Nicotine, cocaine, and amphetamines are the most common _____.

Young Aiden does not demonstrate any real need for a relationship with his parents, has developed no age-appropriate communication skills, and can sit for hours on end rocking back and forth without needing any additional stimulation

If he has a particularly bad moment, he may start punching himself in the face. Aiden might be appropriately diagnosed with __________. a. Asperger syndrome b. autism c. Down syndrome d. childhood disintegrative disorder

A woman's sex drive is related to the levels in her bloodstream of estrogens and

a. androgens. b. serotonins. c. endorphins. d. catecholamines.