The presence or absence of which of the follo | vedclass

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(B) The primary anatomical difference used to distinguish between bony fishes $(Osteichthyes)$ and cartilaginous fishes $(Chondrichthyes)$ is the pres

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Operculum

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(B) The primary anatomical difference used to distinguish between bony fishes $(Osteichthyes)$ and cartilaginous fishes $(Chondrichthyes)$ is the presence of an operculum.In $Osteichthyes$,each side of the body has four pairs of gills which are covered by an operculum (gill cover).In $Chondrichthyes$,the gills are separate and without an operculum.

The presence or absence of which of the following is used to distinguish between bony fishes $(Osteichthyes)$ and cartilaginous fishes $(Chondrichthyes)$?

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