Susan and her brother Stephen are very competitive with one another. Susan always beats Stephen at scramble because she knows more words than he does. This difference is an example of which of the following types of intelligences?

"Psychoactive" describes substances that can affect a person's mood, consciousness, perceptions, thinking, and/or behaviors primarily as a result of their effects on the central nervous system.

a. true b. false

Which of the following statements on infant social interactions is TRUE?

A) Infants are able to play by imitating each other's actions at about six months of age. B) Differences in temperament rarely contribute to infants' interaction style. C) Infants vary greatly in social responsiveness. D) Infants begin to show interest in people their own size around the age of four months.