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Chapter 27: Question 1

1  The air that we normally breathe is composed of which quantity of gases?

A Oxygen 21%, carbon dioxide 0.03%, nitrogen 79%, rare gasses 0.003%
B Nitrogen 21%, carbon dioxide 0.03%, oxygen 79%, rare gasses 0.003%
C Oxygen 21%, carbon dioxide 0.03%, nitrogen 79%, hydrogen 0.003%
D Oxygen 19%, carbon dioxide 0.03%, nitrogen 81%, hydrogen 0.003%