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Solute: a substance that has been dissolved in another substance.

Gases or other dissolved substances are necessary for life processes. Active transportation and diffusion allow dissolving substances to reach their destination. Osmosis allows water to flow.

We know that diffusion allows cells to take in substances they need and get rid of waste products.

However, the amount of surface area to volume (SA:V) an organism has determines the ease with which it can exchange its environment.

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