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My Digital Vocabulary Glossary

Source Word How it was used in the book.  What the dictionary says.
George's Marvelous Medicine Mischief What kind of mischief are you up to in there? Trouble, naughty or bad behavior
  Cartilage There fins are made of cartilage. a part or structure composed of cartilage.
  Tonic immobility It's known as tonic immobility Sharks can be placed in a tonic immobility state by inverting them.
  Extinction of the more that in 400 known sharks species, at least one in four is facing extinction. the act of extinguishing.
  Pectoral fin