Question

how is the balance of oxygen and carbon dioxide maintained in air​

Answer 1

The two gasses named carbon dioxide and oxygen can be balanced in the air or in atmosphere by the oxygen released by plants during photosynthesis and carbon dioxide humans animals etc..

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Answer 2

✨Balance of oxygen and carbon dioxide in the atmosphere:

◼As we know, there are various organisms on earth which perform different activities and also give out some products.

◼The common relationship between plants and animals can be used to prove this. Plants take in carbon dioxide and give out oxygen during their everyday process $-$ photosynthesis where as animals take in oxygen and give out carbon dioxide during their everyday process $-$ respiration.

◼This forms a continuous cycle of give and take of oxygen and carbon dioxide.

◼Therefore, we can say that there is an equal balance of oxygen and carbon dioxide maintained in the atmosphere.