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Question: Before heavy rain comes, the fish in the pond often come to the surface in groups. What is the main reason?
Answer: Breathe oxygen .
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Before a rainfall, the pressure in the atmosphere becomes lower , so the oxygen content in the water is also lower.
At this time, the fish will obey their nature and rush to get out of the water.
Breathe the oxygen contained in the water air to prevent yourself from dying of lack of oxygen.