What does it mean to say that diffusion eventually results in equilibrium?

If you place items together in high concentration, they will want to spread out until they are as far away from each other as possible and take up all of the available space.

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.