Question

Q1. How does it give back life to its own oxygen?

Answer 1

Answer:

Oxygen is taken by human beings and animals and they release carbon dioxide in the air. This CO2 is taken up by plants for photosynthesis and thus they release O2 in the atmosphere. ... Hence, we can say that oxygen is returned to the atmosphere mainly by photosynthesis.

Explanation:

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Answer 2

Answer:

Oxygen is taken by human beings and animals and they release carbon dioxide in the air. This CO2 is taken up by plants for photosynthesis and thus they release O2 in the atmosphere. ... Hence, we can say that oxygen is returned to the atmosphere mainly by photosynthesis.