The accumulation of a substance, such as a toxic chemical, in various tissues of a living organism is defined as

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Bioaccumulation refers to the process by which a substance accumulates in an organism's tissues. This can occur as a result of exposure to a pollutant or other environmental toxin, and can have negative health implications for the organism in question. Body Burden is a related term that refers to the total amount of a substance present in an organism's tissues, and can be used to assess the potential risks associated with exposure to that substance. However, because the question specifically asks about the accumulation of a substance, rather than the total amount present, Bioaccumulation is the best choice. Mutagen refers to a substance that can cause changes in an organism's genetic material, and Biomagnification refers to the process by which toxins become more concentrated as they are passed up the food chain. Carrying Capacity refers to the maximum population size an ecosystem can sustain over the long term.

The Accumulation of a Substance, Such as a Toxic Chemical