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Many synthetic chemicals are widely used, do not easily breakdown, and are moved about by wind, water, and animals. The chemicals, and sometimes their more harmful breakdown products, pollute soil, water, plants, and animals on every continent. Wildlife can and do accumulate many of the long-lasting chemicals (the PCBs, dioxins, and organochlorine pesticides) in their fat and often pass them along to offspring and predators. Exposure to other less persistent toxic chemicals, such as atrazine, alkylphenols, and tributyltin, is also widespread.