For human survival, approximately what percentage of air must be oxygen?
2 answers:
20.9 around 78 percent nitrogen only 20.9 for oxygen
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.
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