decrease in water temperature. reduction in oxygen levels. decrease in food supply. removal of minerals.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The danger posed to fish in an aquarium by an overpopulation of bacteria caused by an algal bloom is most likely a
Possibilities:
- decrease in water temperature.
- reduction in oxygen levels.
- decrease in food supply.
- removal of minerals.

reduction in oxygen levels.