Which gas is present in the smallest percentage of inhaled air?

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Multiple Choice

Which gas is present in the smallest percentage of inhaled air?

Explanation:
Air you breathe is made mostly of two gases: nitrogen and oxygen. The other gases are present only in tiny amounts. In ambient air, nitrogen is about 78%, oxygen about 21%, argon is under 1%, and carbon dioxide is around 0.04%. Because carbon dioxide exists at such a very low concentration compared with the major components, it is the smallest percentage among the options. This low level is why CO2 is kept in check in inhaled air, even though it plays a crucial role in respiration and metabolism.

Air you breathe is made mostly of two gases: nitrogen and oxygen. The other gases are present only in tiny amounts. In ambient air, nitrogen is about 78%, oxygen about 21%, argon is under 1%, and carbon dioxide is around 0.04%. Because carbon dioxide exists at such a very low concentration compared with the major components, it is the smallest percentage among the options. This low level is why CO2 is kept in check in inhaled air, even though it plays a crucial role in respiration and metabolism.

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