an abundance of dissolved oxygen dead zones where there are no fish a reduction in atmospheric carbon dioxide food webs with rapidly growing populations
I gave my students this multiple choice question: Farm fertilizers are often carried by runoff into the Mississippi River and down to the Gulf of Mexico, resulting in algae blooms. Which of these results from the decomposition of the algae blooms?

Only one answer is correct among these 4 choices:
- an abundance of dissolved oxygen
- dead zones where there are no fish
- a reduction in atmospheric carbon dioxide
- food webs with rapidly growing populations

Could you tell me which one is correct?

dead zones where there are no fish