Question

All living things breathe in oxygen. But the percentage in oxygen in the air does not decrease. Why?

Answer 1

A portion of the percent of the oxygen that is discharged from the plants are not completely utilized by us.

The level of oxygen noticeable all around does not diminish in light of the fact that it has been pretty much adjusted by the oxygen creation because of the procedure of photosynthesis.

Answer 2

Explanation:

all living things breathe in oxygen. But the percentage of oxygen in the air does not decrease. ... The percentage of oxygen in the air does not decrease because it has been more or less balanced by the oxygen production due to the process of photosynthesis.