Photo: Jaws, Teeth of Earliest Bony Fish Discovered

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Newly discovered, 420-million-year-old fossils of the earliest known bony fish—about the size of a sardine (above)—show the animal grew teeth from its jawbones.


The find helps scientists learn how tooth-bearing jaws—a trait predominant in modern fish descendants, including humans—developed over time.


Photograph by Franck Bichon/Getty

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