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Answer:
Humans primarily breathe in air, which is a mixture of gases. The main components of the air we breathe are:
• Nitrogen (about 78%)
• Oxygen (about 21%)
• Argon (about 0.93%)
• Carbon dioxide (about 0.04%)
• Trace amounts of other gases such as neon, helium, methane, and krypton
Oxygen is the essential gas for respiration, as it is used by our cells to produce energy.