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Diffusion is the movement of something from an area of high concentration to a lower concentration. Osmosis is a type of diffusion across a semi-permeable membrane.
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How can plants stand upright without any bones?
How do cells respond to salt water?
How do materials get inside or out of a cell?
Source: Amoeba Sisters
This is a fun and helpful tutorial on Osmosis and Diffusion from the BBC.
Gummy Bear Osmosis