These are aquatic or marine species which live in the sediments or bottom part of the body of water. 

Complete this sentence: A high ____________________ indicates good water quality. 

These are microscopic water plants 

It refers to the amount of O₂ that microorganisms in water need to survive.

Living organisms found in estuaries, oceans or coastlines are called ______________.

It means the quality of being cloudy, opaque, or thick with suspended matter.

Theses refers to microscopic water animals.

The indicator of water quality that is consist of sediments or silt and other undissolved matter that contaminates the body of water. 

These are microorganisms that come from animal dung or human feces. 

The common sources of these contaminants are agricultural runoff, industrial wastewater, municipal sewage, and solid wastes.