The proportion of oxygen in the atmosphere is maintained by:

plants

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machines

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animals

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human beings

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Solution

The correct options are
A plants
C animals
D human beings
During respiration in animals and human beings, oxygen is taken in and carbon dioxide is released. During photosynthesis in plants, carbon dioxide is absorbed and oxygen is released. Hence, the proportion of oxygen and carbon dioxide in the atmosphere is maintained by plants, animals and human being.

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