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 is when excess nutrients in aquatic ecosystems cause increased plant - life growth. As the plants die and decompose, oxygen is consumed, leading to decreased oxygen levels in the water. Human activities like agricultural runoff and sewage discharge often cause eutrophication.

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.