Answer: Reversibility
Jean Piaget said that children age 7-11 were in the concrete operational stage. During this stage they developed the cognitive ability to reverse, this means they can understand mental or physical actions can occur in more than one way or in different directions. Alice understood the clay could reverse back into a ball.
They were intended to serve several purposes: eliminate traffic congestion; replace what one highway advocate called “undesirable slum areas” with pristine ribbons of concrete; make coast-to-coast transportation more efficient; and make it easy to get out of big cities in case of an atomic attack.
B. The Supreme Court can declare a state law.
The Constitution is the supreme law of the land giving the supreme court the power to declare a state law unconstitutional if it violates the constitution.
So that they can because successful with what they do.