oxygen
20 Percent.
Oxygen is approximately 21% of the air we breathe.
Oxygen
Oxygen
Oxygen makes up about 20% of Earth's atmosphere.
Oxygen
Oxygen is the gas that accounts for about 20 percent of Earth's atmosphere.
Oxygen is a non-metal gas that makes up about 20% of normal air.
It means that only 20% of the humidity of 100% is in the air.
because it gives 20 percent of air to humanbeing to live
20% of 20% is 4% (=0.04)
20 percent out of 100 is 20 percent. 100 percent is all you can have. 20 is one fifth. 5x20=100