Pectoral arch and appendage. A)Devonian Lobe-fin. B)Hypothetical Intermediate. C)Primitive Amphibian.

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    Licence: Attribution 4.0 International (CC BY 4.0)

    Credit: Pectoral arch and appendage. A)Devonian Lobe-fin. B)Hypothetical Intermediate. C)Primitive Amphibian. Wellcome Collection. Source: Wellcome Collection.

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