When North Korea invaded South Korea in 1950, how did the United States respond? a. The United States did not intervene.
b. The United States declared war on the Soviet Union, the nation supporting the invasion.
c. The United States supported South Korea economically and financially but did not send in any troops.
d. The United States military became directly involved in the conflict

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities