Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.
Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution.
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I think it was D. Dramatic Irony I haven't read that book in a long time tho
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Some people are just strange you just have to try your best to not get to much bothered by it