Question

what is caused by excess fertilizer in aquatic ecosystems?
evaporation
eutrophication
nitrification
none of these

Explanation:

Eutrophication occurs when excessive nutrients (like from excess fertilizer) enter aquatic ecosystems. This leads to overgrowth of algae and other plants. As they die and decompose, oxygen is depleted, harming aquatic life. Evaporation is water turning to vapor. Nitrification is conversion of ammonia to nitrates. So excess fertilizer causes eutrophication.

Answer:

Eutrophication