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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Ответ:
the operculum is a movable flap covering each gill that can pump water over the gills
Ответ:
B
Explanation: