In some form , sharks have been around for about 400 million years.They have the most
powerful jaws on the planet . A shark bites with its lower jaw first and then its upper . It tosses its head back and forth to tear loose a piece of meat which it swallows whole .
powerful jaws on the planet . A shark bites with its lower jaw first and then its upper . It tosses its head back and forth to tear loose a piece of meat which it swallows whole .
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Animaux