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Oxygen is an element which is a gas at room temperature and constitutes approx 20% of Earth's atmosphere. It reacts with many substances to form oxides.

The chemical symbol for Oxygen is O, No. 8 on the periodic chart.

Oxygen is a byproduct of photosynthesis in most autotrophs (plants) and is used in cellular respiration in most animals, including insects, fish, birds, reptiles, and mammals.

It is the useful part of the air for humans and animals. It is grouped with carbon dioxide as one of the respiratory gases. Metabolism in animals combines carbon with oxygen, creating energy and carbon dioxide.
Oxygen is a component of air that is about 21% in composition. It has an atomic number 8.

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