advanced practice nurse a registered nurse having education beyond the basic nursing education and certified by a nationally recognized professional organization in a nursing specialty, or meeting other criteria established by a Board of Nursing.
Quick Answer. The air that makes up Earth's atmosphere contains 20.9 percent oxygen. This is true up to about 70,000 feet above sea level. However, above 10,000 feet, the atmosphere becomes too thin to support human life, even though its proportions do not change much. Continue Reading.
Best Answer: The below make up 99.998% of air. Nitrogen N2 78.084%. Oxygen O2 20.947%. Argon Ar 0.934%. Carbon Dioxide CO2 0.033%. The remaining percentage of air is made up of: Neon Ne 18.2 parts per million. Helium He 5.2 parts per million.