Question

which of the following statements about eutrophication is true? a. eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent increase in the oxygen levels of the water. b. eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the water. c. eutrophication involves the overpopulation of aquatic ecosystems with plant and animal life. d. eutrophication is rarely caused by human activity. please select the best answer from the choices provided

Explanation:

Eutrophication happens when there are excessive nutrients in aquatic ecosystems. This leads to an over - growth of plant life. When the plants die and decompose, the oxygen in the water is consumed, causing a decrease in oxygen levels. Human activities like agricultural runoff and sewage discharge often cause eutrophication. It's not about overpopulation of both plants and animals in a general sense but mainly about plant over - growth due to nutrient input.

Answer:

B. Eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the water.