On which of the following does the self purification process does not depend?

Oxygen demanding wastes improves DO.

Bacteria is diluted in ______

Flowing water bodies recover rapidly.

The quality of the fish habitat begins to increase when the dissolved oxygen concentration drops below 4 or 5 mg L-1.

Which of the following is commonly used?

What is the minimum amount of sample required to perform serial dilution?

__________ is the net movement of mass from one location or component to another.