What is wrong in the statement ?

“We breathe in oxygen and breathe out carbon dioxide”?

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Solution

This statement is wrong because the air we inhale has more oxygen and less carbon dioxide.
The air we exhale has higher concentration of carbon dioxide and lesser concentration of oxygen than in inhaled air.

Gas % in inspired air % in expired air

Oxygen 20.96 16.4

Carbon dioxide 0.04 4

Nitrogen 79 79.6

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