Eutrophication refers to what kind of change in a lake?

A) an increase in depth
B) an increase in nutrient concentrations
C) an increase in species diversity
D) a decrease in nutrient concentrations
E) an increase in oxygen levels

Eutrophication is the process by which a body of water becomes enriched in nutrients, typically nitrogen and phosphorus. This leads to an increase in algae and other aquatic plants, which can deplete the oxygen supply in the water and harm other organisms in the ecosystem.