Seven stage of life .
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The Greenland shark has the longest known lifespan of all vertebrate species(estimated to be between 300 and 500 years), and is among the largest extant species of shark. It is also known gurry or grey shark , one of the largest living species in shark that usully grows 6.4.m (21ft) long and weighs 1,000kg (2,200lb) and possibly to 7.3m (24ft) more than 1,400kg (3,100lb).
The grey sleeper shark is generally consuming verity of food and eaten in Iceland as a delicacy known as (kaestur hakarl) .Hakarl is a delicacy of Iceland where row Greenland shark has been particular fermentation and hang to dry for 4 or 6 month which is perilous ,if the proper prepation isn't fall out ,that because Greenland shark filter their waste through their skin ,meaing that the skin likely to be filed with the toxic substances like urea ,Urea is the chief niteogeous end product of the metabolic break down of proteins in all mammals and some fishes ,the material occurs not only in the urine of all mammals but also in their blood bile ,milk and perspiration .
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