U.S. government website is most likely to contain information based upon empirical evidence.
Answer:
20.9 percent
Around 78% of the air is nitrogen gas, and only 20.9% is oxygen.
Explanation:
20.9 percent
Around 78% of the air is nitrogen gas, and only 20.9% is oxygen.
Hope this helps.
To reduce the risk of cancer, the ACS recommended all of the following except controlling blood pressure.
