Which of the following categories of psychoactive drugs has the LEAST risk for developing physical and psychological dependence?

Simple social play between toddlers typically begins

a. between 12 and 15 months of age. b. between 15 and 18 months of age. c. between 18 and 21 months of age. d. between 21 and 24 months of age.

Thirty-year-old Jiang has lived in China all his life and has only spoken in a common Chinese dialect. Jiang has an infant son named Woo. What linguistic advantage would Woo have over Jiang?

a. Woo would have a larger vocabulary. b. Woo would be better able to distinguish between the "r" and "l" sounds. c. Woo would be producing more grammatically correct sentences than Jiang. d. Woo would have no linguistic advantages over his father.