Question

17 multiple choice 1 point
an abundance of nitrate in lake lewisville created an algal bloom. what effect will this likely have on the lakes dissolved oxygen levels over time?
they will decrease oxygen as algae decompose.
they will not affect oxygen levels.
they will increase oxygen throughout the lake.
they will increase oxygen only at the surface.

Explanation:

Algae decomposition consumes oxygen. As algae die and decompose, bacteria break them down, using up dissolved oxygen.

Answer:

They will decrease oxygen as algae decompose.