___ is a chemical added to water in a water treatment plant to kill the germs present in it.
10.A harmful substances present in land, water, air that pollutes is called a ____ 3Microorganisms present in the polluted water use up the ______ present in it
. 7. ____ damages the ozone layer.
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1
Answer:
chlorine, don't know, Oxygen, ozone
Answered by
0
Answer:
1.chlorine
10. Pollutants
3.protozoa
7.stratosphere
Explanation:
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