The ground-level ozone is a harmful air pollutant that can be a danger to one's health. It is commonly created by chemical between oxides and nitrogen. Similar to ground-level ozone, smog can also be a danger to one's health, especially to the lungs. It is a mixed smoke and fog.
Precise time of an element's radioactive decay can be studied with the help of amount of Carbon on the body. By measuring and comparing the amount of Carbon on the body, Scientists interpret, & can calculate the actual age of an object
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They have different states and so does the U.S.
I think the answer is A hope i helped
