three
Ozone (O3) is a triatomic, molecule, consisting of three oxygen atoms. Ozone in the upper atmosphere protects living organisms by preventing damaging ultraviolet light from reaching the Earth's surface. O3 is the formula for ozone. It has three oxygen atoms.
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Answer:
EATING CHEESE, BUTTER AND CREAM CAN HELP PROTECT YOU FROM HEART DISEASE, STUDY FINDS
Explanation:
The answer would be sewage treatment plants