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Srija Das from Mount Carmel Convent School, Ahmedabad
Subject :NSO    Class : Class 7
Which of the following correctly represents the approximate composition of exhaled air by humans? A O2 = 21% CO2 = 4.4% B O2 = 21% CO2 = 0.03% C O2 = 16.4% CO2 = 4.4% D O2 = 16.4% CO2 = 0.03%

Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
Option C..

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