Question

What could cause a build up of algae which would decrease the amount of oxygen available for the organisms in the river? protecting natural vegetation along the river. erosion of the watershed factory pollution fertilizer run off from crops into the river

Answer 1

In addition, other pollutants like fertilizers, pesticides, and heavy metals are often attached to the soil particles and wash into the water bodies, causing algal blooms and depleted oxygen, which is deadly to most aquatic life.