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          About All Sharks
          Beginning of essay 
SHARK FAMILIES: There are more then 350 know species of sharks today, which can
all be placed under 8 scientific orders that contain 30 families.  They are
placed into these categories by their shared characteristics, this is called
taxonomy.  The more closeley related species are placed in another ....
          Middle of essay ....ead, they have
cartiladge which countrary common belief is rather solid.  In the rarest of
cases complete fossil have been discovered.  Scientific data shows that
following a period of great physiological changes.  There was not to many
changes in the sharks fossil in the millions of  years, of studying the shark
fossils. The Hybodonts who made their appearance some 320 million (years ago the
age of the dinosaurs) where quite common through out both oceanic and fresh
water.  Due to reasons unkno....           |   
          
          
          | Number of words: 761 | 
          Approximate pages: 3 | 
           
           
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