increasing biodiversity increasing water clarity decreasing algae blooms decreasing oxygen levels
I gave my students this multiple choice question: Many fertilizers contain organic materials that are helpful to an orchard but have a different effect when rain causes them to run off into a freshwater ecosystem. How does the addition of organic waste from fertilizers most commonly affect freshwater ecosystems?

Only one answer is correct among these 4 choices:
- increasing biodiversity
- increasing water clarity
- decreasing algae blooms
- decreasing oxygen levels

Could you tell me which one is correct?

decreasing oxygen levels