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butalik [34]
3 years ago
9

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

Biology
1 answer:
Delicious77 [7]3 years ago
8 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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