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B
Pristis
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C
Exocoetus
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D
Betta
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Solution
The correct option is B Pristis Operculum (gill cover) is present in bony fishes and absent in cartilaginous fishes. Pristis is a cartilaginous fish and it lacks an operculum.
Labeo, Exocoetus and Betta are bony fishes and and possess operculum.