The proportion of oxygen and carbon dioxide in the atmosphere is maintained by _______.

only plants

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only animals

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only plants but not animals

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both plants and animals

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Solution

The correct option is D
both plants and animals

During respiration in animals, oxygen is inhaled and carbon dioxide is exhaled. During photosynthesis in plants, carbon dioxide is taken in and oxygen is given out. Hence, the proportion of oxygen and carbon dioxide in the atmosphere is maintained by both plants and animals.

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