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Excretion is the life process of getting rid of waste products and toxins from an organism. For example, the by-products of respiration are usually toxic to the organism that is carrying out respiration, and so they must be excreted.
In most micro-organisms, the toxic substances move out of the cell(s) by a process called diffusion. Diffusion occurs when particles move from an area of high concentration to an area of lower concentration.