The Great Lakes region is a major source of fresh water and home to a diverse group of plants and animals. Which of these factors could disturb the stability of the ecosystem?
A) A decrease in fishing throughout the Great Lakes region.
B) A slowdown of clear cutting and construction in the area.
C) Normal snowfall in winter, ensuring that water levels remain normal.
Eliminate
D) The disappearance of a keystone species due to an increase in water temperature.