"Look, Mom, she is not really happy; you can see it in her eyes!" cries Amelia's little sister. What might this sharp little 4-year-old have spotted?

Research on olfaction

a. has shown that we possess it as a synthetic sense, like vision. b. indicates the existence of four primary odors. c. has found that the olfactory bulbs send information directly to the limbic system. d. has shown that the human olfactory system is relatively insensitive when compared to that of animals. e. classifies it as a form or subtype of gustation since its processes are so similar.

Which of the following is an effect of marijuana at stronger levels of intoxication?

a. It may produce feelings of heightened sexual sensations. b. It can cause smokers to become agitated. c. It can make time seem to pass more quickly. d. It appears to produce more physiological than psychological dependence.