Question

why air is important for us? what percent of air is oxygen?????!!!......

Answer 1

the percent of oxygen in air is 21% and oxygen is necessary for the respiration of living organisms on earth

Answer 2

Air plays a vital role in recycling one of Earth's most important substances: carbon. ... Animals and humans also release carbon dioxide into the air when they breathe. Through a process called photosynthesis, plants extract carbon dioxide from the air and use it to produce energy...

20.95% of air is oxygen...