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19 April, 00:02

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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  1. 19 April, 00:20
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    the operculum is a movable flap covering each gill that can pump water over the gills
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