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Due to Anomalous expansion of water

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aquatic animals can exist in cold countries

aquatic animals can die

water completely freezes

all of the above

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detailed solution

Correct option is A

density of water is maximum at 4 degree Centigrade, as atmosphere temperature falls, when atmosphere is at 4C ,top layer of water sinks to bottom of lake, as atmosphere temperature falls to 0 degree centigrade and top layer freezes but bottom layer of lake at 4C will remain in liquid state , where aqualife survive

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