In cold countries how do aquatic animals remain alive even after the rivers or lakes freeze in winter.

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Solution

Due to anomalous behaviour of water, in cold countries, water changes to ice.

Due to this change, its volume increases and density decreases. So ice floats on water.

Ice is a bad conductor of heat so it doesn’t allow heat to go inside so the water below ice remains as it is. So aquatic animals remain alive even after the rivers or lakes freeze in winter.

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