Question

why do we need oxygen,​

Answer 1

We need oxygen to respire and oxygen is also helpful in maintaining the ecological balance of the environment as all the living organism present in the environment requires oxygen for their metabolic processes.

Hope this answer will be helpful to you dear.

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Answer 2

Explanation:

All cells in our body need oxygen to create energy efficiently. When the cells create energy, however, they make carbon dioxide. We get oxygen by breathing in fresh air, and we remove carbon dioxide from the body by breathing out stale air.