explain briefly how the amount of oxygen in air does not change, inspite of the fact that a large amount of it is used in combustion and respiration?

explain briefly how the amount of oxygen in air does not change, inspi

1.	explain briefly how the amount of oxygen in air does not change, inspite of the fact that a large amount of it is used in combustion and respiration?
Answer» here is your ans.In SPITE of excessive use of oxygen during respiration and combustion, oxygen in the air does not GET depleted. This is due to a process CALLED PHOTOSYNTHESIS. By this process, plants synthesise food from carbon dioxide and moisture in presence of sunlight. In this process oxygen is liberated and goes into the air. Thus, the percentage of oxygen in the atmosphere remains constant.hope it will help you.