One company states that it makes the best staplers. To prove it, they use the stapler to staple a thousand papers and compare it to a competitor. The competitor’s stapler jammed 3x whereas their stapler only jammed once. A: Independent Variable:
B: Dependent Variable:

Mars and earth have quite a few things in common. both are  terrestrial planets, both are located within the sun’s  habitable zone, both have  polar ice caps, similarly  tilted axes, and similar  variations in temperature. and according to some of the latest scientific data obtained by rovers and atmospheric probes, it is now known that mars once had a  dense atmosphere  and was covered with  warm, flowing water.