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Question: Air entering lung is- 1\. Warmed 2. Filtered 3\. Deprived of some oxygen 4. Enriched with CO<sub>2...

Air entering lung is-

1. Warmed 2. Filtered

3. Deprived of some oxygen 4. Enriched with CO2

A

1, 2, 3 and 4

B

1 and 2

C

2 and 4

D

2 and 3

Answer

1 and 2