A Moderate-Size Lake in the American Midwest Suddenly Has Succumbed

Multiple Choice

A moderate-size lake in the American Midwest suddenly has succumbed to an algal bloom.What is the likely cause of eutrophication in this lake?

A) increased solar radiation during the summer season
B) the introduction of non-native tertiary consumer fish
C) excessive farm fertilizer runoff during a heavy rainfall
D) accidental introduction of a prolific culture of algae
E) iron dust blowing into the lake from area factories