Which statement describes how diffusion works?

Molecules always move from inside of the cell to outside of the cell. Molecules always move from areas of high concentration to low concentration. Molecules always move from areas of low concentration to high concentration.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.