An aquarium owner on a rather cold day put a heater in his aquarium, which made by the water warm, but not hot. He thought the fish would like that. However, all his fish died. What could be the reason for this? 

Dear Student ,
As the temperature of water rises so the oxygen dissolved in water evaporates and due to this reason defficiency of oxygen could be observed in water .Resulanty the fishes in the aquarium dies .
Regards

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As the water temperature rises,the oxygen dissolved in water evaporates thus due to defficiency of oxygen.the fishes dies.
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