Question

"in dead zones resulting from eutrophication, animal life is absent due to the lack of _________."

Answer 1

Oxygen

Step-by-step explanation:

Eutrophication means excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.

Answer 2

In dead zones resulting from eutrophication, animal life is absent due to the lack of oxygen

Step-by-step explanation:

The eutrophication is a process of enrichment of a water body by minerals and nutrient due to excessive growth of algae. Contamination of a water body with organic nutrients increases the biological oxygen demand and the chemical oxygen demand of the body.

This is because of the growth of a large amount of microbes including the algae in the water body that results in the reduction of oxygen in the particular water body marking a dead zone.