Water pollution of a river is measured by_______
A. Amount of chlorine dissolve in water
B. Amount of Ozone dissolve in water
C. Amount of nitrogen dissolve in water
D. Amount of oxygen dissolve in water
Answer:D
Water pollution of a river is measured by_______
A. Amount of chlorine dissolve in water B. Amount of Ozone dissolve in water C. Amount of nitrogen dissolve in water D. Amount of oxygen dissolve in water