Oxygen is a chemical element in the periodic table.
It has the symbol O and atomic number 8.
The element is the most common on Earth, composing around 46% of the mass of Earth's crust, and is the third most common element in the universe.
Oxygen is a major component of air, produced by plants during photosynthesis.
For more information about the topic Oxygen, read the full article at Wikipedia.org, or see the following related articles:
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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