persistence, how long it stays in an environment, toxicity, how deadly a substance is, specificity, how many organisms it affects, deoxygenation, removing oxygen from water, biodegradability, how easily a pollutant is broken down by living organisms, mobility, how easily pollutants spread through the environment, solubility, how easily a substance dissolves, bioaccumulation, how easily pollutants are stored in living tissue, biomagnification, the concentration of pollutants along a food chain, synergism, the enhanced interaction of two or more pollutants, mutagen, a chemical which alters DNA, carcinogen, a chemical which causes cancer, teratogen, a substances that causes birth defects.

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