The circle graph above shows the percentages of gases that create the mix of air. Nitrogen takes up the largest part of air whereas oxygen takes up less than a third of that part. A very small part of the mixture is taken by other gases, which include carbon dioxide and water vapor. Oxygen gas is vital to almost all living things.
Text Reference:
Badders, W., Bethel, L. J., Fu, V., Peck, D., Valentino C., & Summers, C. (2003). Discovery works. Boston, USA: Houghton Mifflin Company.
