Even if you live in the middle of north america, the quality of your watershed can affect the quality of the ocean. how can this be?

The correct answer is that the substances in the watershed are ultimately transported to the Oceans.

Explanation:

A watershed refers to the region of land in which the runoffs from the surface goes into the river system or the rivers. All the rivers flow from the upper course, that is, the high elevation to the lower course, that is, the low elevation. In the majority of the circumstances, the lowest point where the flow of the river will take place is the ocean. With the flowing of the river, the transportation and deposition of the substances take place along the course into the ocean.

carbon atoms, hydrogen, oxygen, and nitrogen.