Question

farmers use large amounts of fertilizer on crops. some of it washes into nearby rivers and lakes. which effect is most likely to arise in the water ecosystem? algae will grow rapidly, which can reduce oxygen for fish. fish populations would increase immediately. the water temperature would rise sharply. rocks and soil would dissolve faster.

Explanation:

Fertilizers contain nutrients like nitrogen and phosphorus. When they wash into water bodies, they cause eutrophication. This leads to excessive growth of algae. As algae die and decompose, oxygen is consumed, reducing oxygen levels for fish.

Answer:

Algae will grow rapidly, which can reduce oxygen for fish.