What is diffusion? Include in your explanation “area of high concentration” and “area of low concentration”.
Does diffusion occur across a membrane, without a membrane, or can diffusion occur in both situations?

Diffusion is the net movement of anything (for example, atoms, ions, molecules) from a region of higher concentration to a region of lower concentration. Diffusion can occur in any mixture, including one that includes a semipermeable membrane, while osmosis always occurs across a semipermeable membrane.

Explanation:

you should wear a lead protective shield when having teeth x-rays

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-lavira : )