Choose all the answers that apply.

Todd drops three balls made of different materials to see how high they will bounce. He drops each ball from a height of ten feet. All the balls are the same size.

The independent variable is how high the balls bounce.
The dependent variable is the height the balls bounce.
The independent variable is the type of material the balls are made from.
The height the balls are dropped from is a control.
The size of the balls is a control.