An enzyme known as amylase is found ins the saliva of humans. This enzyme helps to begin the process of digesting starch molecules in the foods we eat. The best description of how enzymes like amylase help in the process of digestion would be that Amylase is a catalyst that speeds up the chemical process of breaking down food molecules.
The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves. The farther it is from the Sun, the weaker the Sun's gravitational pull, and the slower it moves in its orbit.
