Complete the sentences about movement into and out of cells. Diffusion is the net movement of particles down a concentration gradient. The energy for diffusion comes from the .......................................... energy of random movement of molecules and ions. Factors that influence diffusion include concentration gradient, .......................................... , and .......................................... . Osmosis is the movement of water by diffusion through a .......................................... permeable membrane. The movement of particles through a cell membrane against a concentration gradient using energy from .......................................... is called ........................................................... .

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