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BiologyBiology
9 September, 18:34

A substance that enters Earth's cycles and does harm to living things is

A. hydrogen.

B. a pollutant.

C. freshwater.

D. oxygen.

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Answers (1)
  1. 9 September, 20:30
    0
    Pollutants are substances that do harm to an environment and the beings that live in it. Fresh water and oxygen are beneficial and necessary for life. Hydrogen is a naturally occuring element and isn't harmful. The EPA is a government department that works to prevent pollution.
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