Subject :NSO Class : Class 7
Which of the following substances is/are present in a higher percentage in exhaled air than in inhaled air?
(i) Carbon dioxide
(ii) Oxygen
(iii) Water vapour
(iv) Nitrogen
A (i) only
B (i) and (iii) only
C (ii) and (iv) only
D (i), (ii), (iii) and (iv)