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Fishes living in lakes which are prone to freezing in winter, take advantage of this property of water ( having greatest density at 4 degree celsius).

When temperature starts reducing in winter, lake water cools upto 4degree celsius by convection as density increase with reduction in temp.

On further cooling, due to abnormal expansion of water , density reduces & cold water remains at top .Then top layer frezees.Water being bad conductor of heat ,lake water below ice remains at 4 degrees & thus fishes can survive in winter also.

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