The 505-million-year-old fossil of a creature called Metaspriggina shows how vertebrates developed jaws, according to a new study by University of Cambridge researchers.
According to the researchers, the fossil of the tiny fish has well-preserved arches near the front of its body. These arches later gave rise to the jaws in vertebrates, including humans. This is the first time that the structures have been found so early in fossil history.
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