Oxygen and carbon dioxide are replaced in nature through and respectively.

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Oxygen and carbon dioxide are replaced in nature through photosynthesis and respiration.
Air is one of the most important natural resources. All living things require air in order to survive. Plants use carbon dioxide for photosynthesis in the same way that animals use oxygen in the air for respiration. Photosynthesis is the process by which plants prepare food using carbon dioxide and water in the presence of sunlight and chlorophyll. The process of respiration returns this carbon dioxide to the atmosphere. We breathe in carbon dioxide-rich air and burn fossil fuels. Nature replaces oxygen and carbon dioxide through photosynthesis and respiration.

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