Which two factors contributed to the fall of the Western Roman Empire? shift of the capital to Byzantium
dictatorship of the Roman emperors
invasion by Germanic tribes
inefficiency of the Roman soldiers
Odoacer’s aristocracy

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