German geographer friedrich ratzel suggested that each nation needed lebensraum, which means

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

Which number represents the city of berlin, germany? a) 1 b) 2 c) 3 d) 4

Why is the price system a more efficient system for allocating scarce resources than by authoritarian means, such as in command economies?