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Question

Oxygen is returned to the atmosphere mainly by ______.


A

burning of fossil fuel

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B

respiration

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C

photosynthesis

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D

decomposition

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Solution

The correct option is C

photosynthesis


Photosynthesis is a process by which plants convert carbon dioxide into glucose in the presence of sunlight. Oxygen is liberated as a by-product of photosynthesis.
The other processes like decomposition, burning of fossil fuels, and respiration add carbon dioxide to the atmosphere.


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