Decreasing dissolved oxygen (DO) level in a water body
A. Severly threatens the aquatic life
B. is mainly caused by the oxygen demanding wastes
C. indicates the presence of biodegradable organic substances
D. cause undesired taste and color
E. makes it non- drinkable to human beings
Choose the correct answer from the options given below:
1
A, B, C, D only
2
B, C, D, E only
3
A, C, D, E only
4
A, B, D, E only