One of the items below is a hazardous substance and the other four are sources of a hazardous substances. A. clogged furnace B. cigarette C. a dog D. paint applied before 1978 E. dust mite parts A hazardous substance is a chemical that causes harm to our health. Dust mite parts cause an allergic reaction in many people. The source of dust mite parts is dust mites.
Dust mites live in carpets, bedding and curtains.
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