Answer:
A
Explanation:
Nutrient population is mainly as a result of unsustainable farming methods that are rampant in the world. The excessive use of fertilizers in farms results in nutrient runoffs to water bodies. The nutrients especially phosphorus and nitrogen when consumes with water can be harmful to humans and animals. The nutrients also cause eutrophication of water. The anoxic waters harbor dangerous disease-causing bacteria, unlike oxygenated water.
