Question
Question: When domestic sewage mixes with river water -...
When domestic sewage mixes with river water -
A
Small animals like rats will die after drinking river water
B
The increased microbial activity releases micronutrients such as iron
C
The increased microbial activity uses up dissolved oxygen
D
The river water is still suitable for drinking as impurities are only about 0.1%
Answer
The increased microbial activity uses up dissolved oxygen