An international research team led by Faviel A. López-Romero from the Department of Paleontology at the University of Vienna investigated how the jaw shape of sharks has changed over the course of evolution. They conclude that in the most widespread shark species, the jaws show relatively little variation in shape over millions of years; most variable jaws were found for deep-sea sharks. The results of this study were published in the journal Communications Biology.
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Source: Phys.org