Question

1) Industrial waste water and ______ are the major causes of pollution of river.
2) Organic matter is decomposed by_______ bacteria in aeration tanks.
3) The solids that separate out from sewage after the action of bacteria are referred to as_________sludge.

Answer 1

Answer:

1.toxic gases

2.saachromaxic serevasive

3.magnetic

Explanation:

SELECT TO BRAINLIST ANSWER..

Answer 2

1. toxic gasses

2. saarchromaxic serevasive

3. magnetic