Assertion: tissue's number | /r/CapableOf | decrease in gorgosaurus libratus
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text: An early suggestion for distinction was based on Nanotyrannus possessing at least two more teeth in both jaws than other specimens referred to Tyrannosaurus, but in his 1999 study of tyrannosaurid growth patterns, Carr showed that in Gorgosaurus libratus, the number of teeth decreased as the animal grew, and he used this data to support the hypothesis that N. lancensis is simply a juvenile T. rex.