BI-2241
Aerobic respiration
Biology · Secondary 4 · Medium · Aerobic respiration
In a lake, many fish die suddenly and start decomposing. Which statement explains why the concentration of dissolved oxygen in the water falls after this event?
- Bacteria respire aerobically while decomposing the fish, using up dissolved oxygen.
- Dead fish release oxygen into the water as they decay.
- Photosynthesis in algae stops using carbon dioxide.
- Water temperature decreases, so oxygen escapes into the air.
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