You are called to investigate a lake in your home town, where the residents fear that a broken pipe from the local sewage treatment plant has turned the formerly pristine lake eutrophic. You test the water and find very low levels of oxygen. What stage of euthrophication is this lake in?

The correct answer is - The decomposers decompose dead algae and plants which take up most of the oxygen.

Explanation:

Eutrophication is taken place when there is a high amount of nutrients, minerals are present in a waterbody which allow algae to grow rapidly and cause depletion of oxygen due to the decomposition of dead organisms. There are the following stages in the eutrophication process:

-  rapid growth of Algae and other plants

- due to algal bloom, the sunlight is blocked, and plants and organism start dying.

- The decomposers take up most of the oxygen by decomposition

- The animals start dying without oxygen

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