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November 3 2013

Prehistoric sharks escaped mass extinction by 'seeking refuge in the depths of the ocean'


Sharks have roamed the world's seas for more than 420 million years and now scientists think they know one of the secrets of their longevity.

Experts believe they have solved the riddle of why sharks survived the mass extinction that began 252 million years ago, wiping out around 80 per of all life on Earth.

Fossil evidence has hinted that the fish survived the global catastrophe, known as the 'great dying' by diving deeper.

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