Question

which human activity contributes most to excess phosphorus in aquatic ecosystems? your answer fossil fuel combustion use of synthetic fertilizers overharvesting forests industrial emissions

Explanation:

Synthetic fertilizers are rich in phosphorus. When they are used in agriculture, runoff can carry excess phosphorus into aquatic ecosystems. Fossil - fuel combustion mainly releases pollutants like sulfur and nitrogen oxides, overharvesting of fisheries doesn't directly contribute to excess phosphorus, and industrial emissions typically involve other pollutants rather than large amounts of phosphorus.

Answer:

B. use of synthetic fertilizers