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The toxic effects of Mercury depend on its chemical form and the route of exposure. Methylmercury [CH3Hg] is the most toxic form. It affects the immune system, alters genetic and enzyme systems, and damages the nervous system, including coordination and the senses of touch, taste, and sight.

A significant problem is that mercury bioaccumulates. Each stage in the food chain (water insects --> minnows --> trout --> peole) receives a more concentrated dose which amplifies the effects.

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