Osmosis, or the movement of water into and out of a cell, is directly related to the concentration gradient on both sides of the cell membrane and indirectly to the fact that

Indirectly to the fact that it does not need energy to transport water from a concentration gradient.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.