because plants create oxygen from carbon dioxide in the air. they do this because they require the carbon to grow.
Roughly about 21% of air is oxygen.
Inhaled air has more oxygen compared to exhaled air. When we inhale, we take in fresh oxygen from the environment to use for cellular respiration. As we exhale, we release carbon dioxide and the remaining oxygen that was not used by the body.
21% of oxygen is in the air so 0.21 is your answer
Yes, cold air typically has more oxygen compared to warm air because cold air is denser and can hold more oxygen molecules.
The percent of oxygen in dry air is approximately 21%.
Oxygen is in the air.
No, there is 21% oxygen in air.
in our air is there mostly oxygen
When photosynthiesis occures...it releases oxygen into the air
Dyr air is about 21% oxygen.
There is oxygen,air,and carbon dioxide
Uh...sorry to break it to you, but oxygen is air.
Room air is about 21% oxygen.
About 21% of inspired air is oxygen.
Roughly about 21% of air is oxygen.
Approximately 21% of the air we breath is oxygen.
Air is approximately 20% Oxygen.