Which statement best describes the long-term risk of persistent organic pollutants (POPs)?

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Persistent organic pollutants stay in the environment for a long time because they resist degradation. This persistence means they don’t break down quickly and can travel through air, water, and soil, eventually accumulating in the fatty tissues of living beings. As they move up the food chain, their concentrations amplify (bioaccumulation and biomagnification), so long-term exposure occurs even after the original source is reduced or removed. That combination—long-lasting presence and buildup in organisms—drives the long-term risk associated with POPs, making this statement the best description. The other options fail because POPs do not degrade rapidly, are not completely eliminated by environmental processes, and they can be found in multiple environmental media, not just air.