Sewage that has not been treated is released by accident into a river for several weeks. What effect will this have on the number of bacteria, the oxygen concentration in the water, and the number of fish?
- Anumber of bacteria decrease; oxygen concentration decrease; number of fish increase
- Bnumber of bacteria increase; oxygen concentration decrease; number of fish decrease
- Cnumber of bacteria decrease; oxygen concentration increase; number of fish decrease
- Dnumber of bacteria no change; oxygen concentration no change; number of fish no change