What word describes a cell that carries out diffusion faster than another cell?

diffusion is how cells get much of what they need, such as water, nutrients, and irons. will diffusion and osmosis be enough to support a cell of any size?

No, also active transport would be necessary

Diffusion occurs because of the movement of molecules from the region of higher concentration to the region of lower concentration. This movement of molecules occurs due to a thermal motion. Diffusion normally occurs between two compartments having difference in concentration. In case of fluid it moves from the region of higher concentration to the region of concentration until a balance is reached. The process of diffusion is very important for the humans as well. The oxygen that humans breathe in gets diffused with the blood.

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