Question

question 15
the greatest source of both nitrogen and phosphorus entering chesapeake bay is _.
o municipal and industrial wastewater
o agriculture
o urban fertilizer runoff
o septic systems
o natural sources

Explanation:

Agriculture is a major source of nitrogen and phosphorus. Agricultural activities like the use of fertilizers and manure can lead to runoff. Municipal and industrial wastewater, urban fertilizer runoff, septic systems, and natural sources contribute but are not as significant as agriculture in terms of being the greatest source for both nitrogen and phosphorus entering Chesapeake Bay.

Answer:

agriculture