What is O3 (O followed by the number 3, usually shown in sub-script)
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Oxygen
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Oxytone
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Oxford
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Ozone
D
Correct answer
Explanation
O3 represents ozone - a molecule consisting of three oxygen atoms. It is not the same as oxygen (O2), oxytone (a linguistic term), Oxford (a city), or Oxford University. Ozone plays a crucial role in the atmosphere, both as a protective layer in the stratosphere and as a pollutant at ground level.