Operculum is present in.

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(B) The $Operculum$ is a bony flap that covers the gills in fish.In $Osteichthyes$ (bony fishes),each side of the body has four pairs of gills which a

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Osteichthyes

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(B) The $Operculum$ is a bony flap that covers the gills in fish.In $Osteichthyes$ (bony fishes),each side of the body has four pairs of gills which are covered by an $Operculum$ on each side.In contrast,$Chondrichthyes$ (cartilaginous fishes) lack an $Operculum$ and have separate gill slits.Therefore,the correct answer is $Osteichthyes$.

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