Which drug, depending on the dosage, can be a hallucinogen, stimulant, depressant, or painkiller?

A baby's first words usually come in the form of ___________, which are one-word utterances that stand for a whole phrase, whose meaning depends on the particular context in which they are used

a) phonemes b) semantics c) holophrases d) morphemes

Both aversion therapy and systematic desensitization are based on conditioning

a. classical b. operant c. resistance d. instrumental