A Major Depressive Episode requires ________ of nine symptoms, including a depressed mood and/or diminished interest in activities for at least two weeks.

What did Charles Darwin believe about the origin of emotions?

a) They are learned through experience. b) They do not merit scientific consideration. c) They are a product of evolution. d) They are remnants of our earliest ancestors and, thus, have little relevance today.

Research on language development shows that:

a. infants are born prewired to learn their native language. b. children are born able to speak any language and this ability never goes away. c. children are born ready to learn any language but quickly adapt to their native language. d. Children cannot discriminate the sounds of any language until about 2 years of age.