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Tetrapods, whose closest living relatives are lungfish , have two main groups: amphibians and amniotes.
The fins are very flexible and potentially useful for supporting the body on land, as in lungfish and tetrapods.
This looks a little like a lungfish and is half fish, half eel shaped.
The lungfish use lungs as accessory breathing organs, and during droughts modern forms can survive for several years in burrows.
Compare with the lungfish , another example of living fossil.
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