Why may fish living in ponds survive temperatures below ${0^ \circ }C$ in winter?
1 )
Fish body tissues produce an enzyme which prevents blood from freezing.
The ice on the pond surface insulates the water in the pond.
3 )
The plants in the pond help to keep the water temperature above ${0^ \circ }C$.
4 )
The rocks in the pond warm up during the day and heat the water.
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