Ruthie has a pet goldfish. After several months the goldfish quits growing. Ruthie's Mom told her the goldfish might have stopped growing because the tank is too small. Ruthie measures the size of her goldfish in its current tank and then puts the goldfish in a larger tank. After 2 months the goldfish is now 1 cm longer.
A. Independent Variable=
B. Dependent Variable=
C. Control=