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.
Â· just now. Report Abuse. air is composed of the following which we breathe in Nitrogen, N2 (78%) n Oxygen, O2 (21%) n Argon, Ar (0.9) n Carbon Dioxide, CO2 (365 ppm) also there is always some water content in what we breathe in if the air is humid and we breath out mostly water vapor and carbon dioxide.