A-5,B-4,C-1,D-3,E-2.
A. CO is the gas which has 200 times more affinity for blood cells as compared to oxygen.
B. Sulfur dioxide is the gas reacting with water to form sulfuric or sulfurous acid known as acid rain.
C. Biogas is the cowdung which is a natural source of fuel and it is composed of methane gas.
D. Fermentation which takes places in presence of oxygen is Aerobic.
E. Fermentation which takes place in absence of oxygen is Anaerobic.