an increase in oxygen levels in the pond. plants near the pond growing more quickly. the toxic chemicals having no effect on the pond. fish in the pond being harmed or dying off.
I gave my students this multiple choice question: Dumping toxic chemicals into a pond would most likely result in

Only one answer is correct among these 4 choices:
- an increase in oxygen levels in the pond.
- plants near the pond growing more quickly.
- the toxic chemicals having no effect on the pond.
- fish in the pond being harmed or dying off.

Could you tell me which one is correct?

fish in the pond being harmed or dying off.