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Analytical chemistry -- A task that would fall into this area of chemistry is measuring the level of lead in drinking water.
The balanced chemical equation is P4+3O2--> 2P2O3
Fertilizer use the run on can go into fresh water
B.
The cynobacteria were already there without the oxygen, so that rules out A, and a lot of prokaryotes were anaerobic, so that rules out C. Finally, Photosynthesis does not require oxygen. Instead, Oxygen is a waste product of it. Therefore, it cannot be D. So, we are only left with B
Hoped this helped :D
