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A substance that enters Earth's cycles and does harm to living things is A. a pollutant. B. freshwater. C. hydrogen. D. oxygen.
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A substance that enters Earth's cycles and does harm to living things is

A. a pollutant.
B. freshwater.
C. hydrogen.
D. oxygen.

User Tlingf
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1 Answer

4 votes
The answer is A. Pollutant

User Msmazh
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