Which statement correctly describes the motion on which an earth time interval is based?
a. earth's year is based on the sun's revolution.
b. earth's day is based on the earth's rotation.
c. earth's day is based on the sun's revolution.
d. earth's year is based on the earth's rotation.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

where is the