The majority of U.S. soldiers who used heroin in Vietnam did so through the intravenous route because the drug was relatively impure

Which of the following statements is true?

According to Piaget, the first period of cognitive development is the sensorimotor period, which lasts from birth until about age 4. The theory of infant language development that holds that communication with others is the crucial element is referred to as the linguistics theory. In the final stage of sensorimotor intelligence, toddlers begin to anticipate and solve simple problems by using mental combinations. The child's first word combinations, for example, "More cookie," or "My ball," are called holophrases.

Which of the following indicates the correct flow of olfactory information?

a. Olfactory bulb ? olfactory receptors ? olfactory nerve ? brain b. Olfactory receptors ? olfactory bulb ? olfactory nerve ? brain c. Olfactory bulb ? olfactory nerve ? olfactory receptors ? brain d. Olfactory receptors ? olfactory nerve ? olfactory bulb ? brain