Answer :
When a waterway undergoes eutrophication, the most likely outcome is an overpopulation of aquatic plants. This happens because eutrophication occurs when excess nutrients, like nitrogen and phosphorus, enter the water. These nutrients lead to increased plant growth, including algae and other aquatic plants. As these plants grow rapidly, they can cover the water's surface, blocking sunlight from reaching the lower depths. This can lead to a decrease in oxygen levels in the water, which can harm aquatic life such as fish and other organisms.
In addition to overpopulation of aquatic plants, eutrophication can also result in the reduction of the algae population. This might seem contradictory, but initially, the excessive nutrients can cause a bloom of algae. However, as the nutrients deplete and the algae die off, this can lead to a reduction in the overall algae population in the waterway.
Therefore, the two most likely outcomes of eutrophication of a waterway are overpopulation of aquatic plants and the subsequent reduction of the algae population.
