Which characteristic is common to all the major reptilian lineages Testudinia, Lepidosauria, Crocodilia, or Aves)?

Name: Which characteristic is common to all the major reptilian lineages Testudinia, Lepidosauria, Crocodilia, or Aves)?
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All major reptilian lineages, including Testudinia (turtles), Lepidosauria (lizards and snakes), Crocodilia (crocodiles and alligators), and Aves (birds), have a notochord at some stage of their development, as it is a characteristic of all vertebrates.

Which Characteristic Is Common to All the Major Reptilian Lineages