Question

what do you meant by oxygen​

Answer 1

Answer:

A chemical element that constitutes 21 percent of the Earth's atmosphere, that is capable of combining with all elements except some noble gases, that is active in physiological processes of almost all known organisms, and that is involved especially in combustion — see Chemical Elements Table.

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Answer 2

Answer:

Oxygen. An element, normally a gas, that makes up about one-fifth of the atmosphere of the Earth. Oxygen is usually found as a molecule made up of two atoms. Its symbol is O.

The maximal ability to deliver oxygen to the tissues of the body establishes the upper limit of endurance performance; however, the ability of the skeletal muscles to utilize a high oxygen load for a sustained period of time is also of great importance.