What is the percentage of oxygen in the air? Name the biological process by which it is mainly returned to the atmosphere.

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Solution

Oxygen:
It is a colorless, odorless reactive gas we inhale during respiration.
The percentage of oxygen in the air is 20.94%.
The biological process by which it is mainly returned to the atmosphere is photosynthesis.
This is the process by which green plants and other organisms prepare their food using sunlight.

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