Respuesta :

First answer is correct. Eutrophication can have serious effects, like algal blooms that block light from getting into the water and harm the plants and animals that need it. If there's enough overgrowth of algae, it can prevent oxygen from getting into the water, making it hypoxic and creating a dead zone where no organisms can survive.

Eutrophication is the enrichment of the water bodies with excessive nutrients. As a result of eutrophication, algae deplete the oxygen causing the fish to die. Thus, option A is correct.

What is eutrophication?

Eutrophication causes an excess increase in nutrients and minerals like nitrogen and phosphorus in the water body. It in turn increases the algal growth.

The algal bloom in the water causes a decrease in the biological oxygen demand (BOD) of the water resulting in the death of the fish. The lack of oxygen in the water leads to fish death.

Therefore, eutrophication causes fish death by the algal bloom.

Learn more about eutrophication here:

https://brainly.com/question/13232104

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