There is ...............percent of Niterogen in the air: ?
Correct answer: D. 78%
- A. 92%
- B. 87%
- C. 76%
- D. 78%
Explanation
Nitrogen makes up about 78% of dry atmospheric air, while oxygen makes up about 21%. The other percentages do not match the standard composition of air.
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Practise Health and Nutrition
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