Breathing and Exchange of GasesHard

Question

Air entering lungs is
(1) Warmed
(2) Filtered         
(3) Deprived of some oxygen
(4) Enriched with CO2
What is true ?

Options

A.1, 2, 3 and 4
B.1 and 2
C.2 and 4
D.2 and 3

Solution

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