4. a chair has a mass of 10 kilograms on earth. what is the mass of the chair on mercury?
o a. 10 kilograms
b. more than 10 kilograms
c. less than 10 kilograms
d. not enough information

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