Question

Dried ____________ is used as manure. Fill in the blank.
Topic: Waste water

Answer 1

"Dried sludge is often used as manure.

Sludge is nothing but accumulated solid content from the waste water.

It is often used as manure because those are biodegradable materials which are made of mostly of food and human waste which acts as a good manure for the plants.

Therefore, sludge is often used as manures.  

"

Answer 2

Answer:

Dried sludge is used as manure

Answer = sludge

Thanks!