The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
A. 1 ppm
B. 4 ppm
C. 10 ppm
D. 40 ppm
Answer:B
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
A. 1 ppm B. 4 ppm C. 10 ppm D. 40 ppm