Final answer:
To prevent dead zones from forming in a water body experiencing eutrophication, measures to reduce nutrient pollution should be implemented, such as managing agricultural practices and upgrading wastewater treatment plants.
Step-by-step explanation:
In order to prevent dead zones from forming in a water body that is already experiencing eutrophication, the best course of action would be to implement measures to reduce nutrient pollution. Nutrient pollution, which occurs when there are excessive amounts of nutrients (mainly nitrogen and phosphorus) in the water, leads to eutrophication and the subsequent formation of dead zones.
One approach to reducing nutrient pollution is to implement agricultural practices that minimize the use of fertilizers and manage run-off effectively. This can include using precision agriculture techniques, such as applying fertilizers only where and when they are needed, and implementing buffer zones along water bodies to capture and filter nutrient-rich agricultural run-off.
Another strategy is to upgrade wastewater treatment plants to remove nutrients more effectively before discharging the treated water into water bodies. This can involve implementing advanced nutrient removal technologies, such as biological or chemical processes, to reduce nutrient concentrations in wastewater effluent.