Nearly all the chemicals that humans can detect as odors come from living things.

Name: Nearly all the chemicals that humans can detect as odors come from living things.
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Most odors that humans can detect are caused by volatile organic compounds that are produced by living organisms, such as plants, animals, and bacteria. However, there are some odors that are synthetic and man-made, such as gasoline or cleaning chemicals.

Nearly All the Chemicals That Humans Can Detect as Odors