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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Your audience would be the teacher or whoever is grading you, because the purpose of a critical analysis as to examine your point of you of the topic and how you structure of the essay based off of your opinions and possibly facts