The blood coming out of lungs is richer than that entering into lungs in (a) C02 (b) 02 (0) Both (d) None of these.

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Please find below the solution to the asked query      
                                                        
The blood coming out of lungs is richer than that entering into lungs in oxygen. The deoxygenated blood enters the lungs for oxygenation during which the impure blood is purified. This purification of blood in lungs is called oxygenation.  
Hence, option (b) is correct.

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