Today, many take it for granted that there is a president in the U. S., along with two houses of Congress. When the Constitution was being written, none of this was certain. Take a moment to imagine: how could the U. S. Constitution have been different?

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