Country A is rich with natural resources. Its lush forests provide timber, its fertile soil is used to farm produce and cotton, and its vast mineral reserves are virtually untapped. Country B is heavily industrialized and is a major manufacturer of equipment, automobiles, and technology. Why should the two countries trade with each other?

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