air entering into the lungs is
enriched with co2
deprived of some oxygen
whch are correct?
1 and 2
1 2 3 4
2 and 4
2 and 3

Dear student,
the air entering the lungs is 1 warmed and 2) filtered.
As air passes through the nasal cavities it is warmed and humidified, so that air that reaches the lungs is warmed and moist. the cilia present in nasal airways filters the ir.

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