Opercula are absent in cartilaginous and jawless fishes and represent an evolutionary advancement seen in bony fish. How do opercula allow a bony fish to pass water over its gills while the fish remains

Opercula are absent in cartilaginous and jawless fishes and represent an evolutionary advancement seen in bony fish. How do opercula allow a bony fish to pass water over its gills while the fish remains statrionary? Why would this be viewed as an adaptation?

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Opercula are absent in cartilaginous and jawless fishes and represent an evolutionary advancement seen in bony fish. How do opercula allow a bony fish to pass water over its gil…

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