What are mental categories representing activities, objects, qualities, or situations that share some core qualities?

Jean Piaget's constructivist view basically claimed that newborns

A) are unable to determine which sense they are using. B) are able to combine their senses well at birth. C) prefer using only one of their senses at a time. D) do not realize that what they see may be what they are hearing.

The average age at first marriage in the U.S. from 1970 until now: a. Has remained constant

b. Has increased. c. Has increased. d. Has increased for men and remained the same for women.