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Question

How is the percentage of oxygen in an atmosphere maintained?

A
consumption of carbon dioxide by plants
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B
consumption of oxygen by living beings
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C
consumption of oxygen by plants
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D
consumption of carbon dioxide by animals
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Solution

The correct options are
B consumption of carbon dioxide by plants
C consumption of oxygen by living beings
The percentage of oxygen in an atmosphere is maintained by consumption of carbon dioxide by plants and consumption of oxygen by living beings.
Hence options A and B are correct.

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