Question

water quality involves measuring ihe number of colonies of

Answer 1

coliform bacteria colonies

Answer 2

Here is the completion of your question

Water quality involves measuring the number of colonies of

Cells

Protozoa

Chromosomes

Coliform bacteria

The correct answer for your question is option (B)-Protozoa

Protozoa are micro parasites that improve the water quality by eating the bacteria  and other particles in the water. They are parasites that depend on other organism to live. They can be found in any environment on the planet from the peak of the mountain to the deepest of the ocean.