The inner planets are Mercury, Venus, Earth, and Mars. These four planets are small and solid and have few or no moons. All but
Mercury have an atmosphere large enough to create weather. The outer planets are Jupiter, Saturn, Uranus, and Neptune and are all gas giants. These large planets are composed of gasses such as hydrogen and helium and ices. They have many moons--Jupiter has sixty-six!
Question
What does this article compare and contrast?
The answer is D. With mechanical advantage, less work is put in for a better result. It can apply force in a shorter distance, but increase distance itself.
