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Phylum: Echinodermata
Its ears were poorly developed
lobsters and insects with external skeletons
Duckbill jaw
and traces of worms and trilobite tracks (called Cruziana)
Tyrannosaurus rex, Shed or Broken Tooth Ankylosaurus Phylum: EchinodermataTyrannosaurs rex Shed or Broken Tooth The original tooth was found in the Hell Creek Formation of South Dakota and may have been 12 inches long including the root. Yes, T rex teeth were big and strong but they did break them while feeding and crushing the bones of other dinosaurs. These broken teeth are called shed teeth. Fortunately, when a tooth was broken or shed it was slowly replaced by another tooth growing out of the jaw. Its teeth were also
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