Question

How does oxygen exist in the combined state in
nature?​

Answer 1

Answer:

oxygen remains in h20 ,so2,so3,co,co2 and other organic compond

Explanation:

Answer 2

Answer:

Oxygen from the atmosphere is used up in three processes, namely combustion, respiration and in the formation of oxides of nitrogen. Oxygen is returned to the atmosphere by the process called as photosynthesis.

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