Birds, snakes, lizards, turtles, and crocodiles are all thought to share a common ancestor and several homologous traits.Assuming that this is true, these groups of animals and their common ancestor would represent

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A monophyletic group includes an ancestor and all of its descendants, which is the case for birds, snakes, lizards, turtles, and crocodiles sharing a common ancestor.

Birds, Snakes, Lizards, Turtles, and Crocodiles Are All Thought to Share