A majority of the pollution entering the Chesapeake Bay comes from many sources of agricultural runoff, and lawn fertilizers. Roughly 40 percent is nitrogen, 50 percent is phosphorus, and 10 percent is from other nutrients. This type of pollution is called
O point source pollution
industrial waste
O heavy metals
Ononpoint source pollution

you can have just about every answer you can think of

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.