The leading cause of death in the United States is _____ _____ disease

Classical conditioning was accidentally discovered by Russian physiologist Ivan Pavlov while he was studying digestion

Indicate whether the statement is true or false.

There is strong research support for Piaget's notion that

a. deductive reasoning emerges in adolescence. b. utopian thinking emerges by age 8 or 9. c. young children can think hypothetically. d. sophisticated use of symbols, such as "x," does not occur until middle age.