Some linguists argue that the extraordinary size of the human brain in comparison to other species is largely due to the evolution of ____

Heroin is more potent than morphine because

A. it is often injected instead of swallowed. B. it more readily crosses the blood-brain barrier. C. it is a natural opioid. D. it is a synthetic opioid.

A mother and her four­year­old daughter hear the grandmother refer to the weather outside as "it's raining cats and dogs."The mother tends to get one meaning from this phrase, while her daughter is hoping for a lot of new pets. In understanding the phrase "it's raining cats and dogs," the mother and daughter are experiencing a difference in

a. syntax. b. phonemes. c. semantics. d. grammar.