In cold countries, in winter, even when the water of lakes freezes, aquatic animals and plants can survive. Give reason

Explanation

(1) In cold countries, in winter, a layer of ice is formed on the surface of lakes when the atmospheric temperature falls below `0^(@)C`. However, below this layer, there is water at `4^(@)C`.
(2) Ice, being a bad conductor of heat, does not allow transfer of heat from this water to the atmosphere. Hence, aquatic animals and plants can survive in this water.