How does oxygen and carbon dioxide remain nearly constant in the atmosphere?

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Solution

Oxygen and carbon dioxide nearly remain constant in the atmosphere by the processes of photosynthesis in plants and respiration in animals along with combustion.

Nearly all living cells use oxygen to obtain energy from their food using respiration which takes in oxygen from the atmosphere and releases carbon dioxide. Combustion of substances need oxygen and release carbon dioxide in the atmosphere.

Plants produce their own food in the form of glucose by the process of photosynthesis that uses sunlight and carbon dioxide from the atmosphere and releases oxygen.

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