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Humans are commonly exposed to toxicants through three major routes: ingestion, inhalation, and dermal (skin) absorption. Ingestion involves the intake of toxic substances through food, water, medicines, or accidental swallowing of chemicals. Inhalation occurs when toxic gases, vapors, fumes, dust, or aerosols are breathed into the lungs. Dermal exposure happens when toxicants come into contact with _______ __________ _______ _____ _________ ___ ________ ________ _________ _________ ___ ________.
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