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" ... Today, coelacanths breathe underwater using gills like most fish. But these findings indicate that perhaps this was not always the case. The study reveals that the embryos of these fish have a well-developed, “potentially functional” lung that suggests this organ may have also been functional in early coelacanths. In modern coelacanths, the lung becomes less developed as the animal grows and is eventually completely useless. It's possible that the lung could have been used for supplemental air breathing capabilities in the shallow, hypoxic environments coelacanths lived in during the Mesozoic Era. ... "