[DOC] [TLE] No bones about it: sharks evolved cartilage for a reason [PAR] May 28, 2015 ... But because their skeletons are made of cartilage much of their early fossil record 
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... but its remains are compressed, unlike the new fossil shark from ... to all other 
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prevent it from sinking to the ... In addition, the cartilage is more flexible than bone
. [DOC] [TLE] Shark - Wikipedia [PAR] Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven 
gill slits on .... There are more than 470 species of sharks split across thirteen 
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Question: (Sarah of the Clue Crew reports from the shark tank.) Unlike most other fish, sharks don't have bones; their skeleton is made up of this tough, flexible tissue.
Answer: cartilage