When we inhale, we breathe in air into the lungs. What do we breathe o – McqOptions

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1.	When we inhale, we breathe in air into the lungs. What do we breathe out when we exhale?
A.	Only oxygen gas.
B.	Only hydrogen gas.
C.	Air that has more oxygen than inhaled air.
D.	Air that has more carbon dioxide than inhaled air.
Answer» E.

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