Research into new technologies provides a a. negative externality, and too many resources are devoted to research as a result. b. negative externality, and too few resources are devoted to research as a result. c. positive externality, and too few resources are devoted to research as a result. d. positive externality, and too many resources are devoted to research as a result. g

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