how fish adapted there live in cold weather
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Underneath the frozen upper layer, the water remains in its liquid form and does not freeze. Also, oxygen is trapped beneath the layer of ice. As a result, fish and other aquatic animals find it possible to live comfortably in the frozen lakes and ponds. ... This irregular expansion of water is called anomalous expansion.
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The evolution of antifreeze glycoproteins (AFGPs) in Antarctic and Arctic fish is a classical example of adaptation developed independently at both poles. To avoid death by freezing, fish in these environments have evolved antifreeze compounds secreted into their blood at high concentrations.
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