Domestic sewage is harmful for all forms of life.

1. Domestic sewage contains water originating from kitchen, bathroom, toilet, etc.

2. There are detergents and washing powders containing phosphate, which are used to soften the water.

3. These chemicals are harmful to aquatic animals.

4. They also contain disease - causing pathogenic bacterial and ciruses.

5. Hence, domestic sewage is harmful to all form of life.