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Antarctic fish. To stop their blood from freezing, some fish that live in the arctic and Antarctic have special Antifreeze proteins. Antifreeze proteins are very clever, as they slow down the formation of bonds between water molecules, which prevents the formation of ice crystals in the fish's blood.
Genetic variation or coral spawning
Just google his theory becasue we are not allowed to copy and paste sorry that i couldnt be off assistance
When a cell needs energy it gets from the food that we eat and works like as usual.