What would happen to aquatic life if water contracts on cooling till $0^{o} C$ and expands on heating?

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Solution

Water shrink till it reach the the temperature $4^{\circ} C$ , after that unlike any other compound.
During winters when the temperature drops, also the temperature of water drops to $4^{\circ}$ , below which when water starts to freeze it expands hence its density decreases, by this colder liquid to remain on the top and the temperature of water below which doesn't drop. The ice stars forming from top and it will starts start behaving likes an insulator.
If water contracts on cooling till $0^{\circ}$ whole this system will be disturbed and whole water is freezes, which kills the aquatic life.

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