Mammals evolved most directly from the _____ vertebrate group.

Name: Mammals evolved most directly from the _____ vertebrate group.
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Mammals evolved most directly from the reptile group. This can be seen in the fossil record, which shows a transition from synapsid reptiles (such as Dimetrodon) to early mammalian ancestors (such as Morganucodon). Reptiles are the closest living relatives of mammals, sharing a common ancestor that lived around 320 million years ago.

Mammals Evolved Most Directly from the _____ Vertebrate Group