The gills are not covered in while have gills covered by operculum.
A
Echinoderms
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B
Osteichthyes
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C
Chondrichthyes
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D
Platyhelminthes
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Solution
The correct options are B Osteichthyes C Chondrichthyes In cartilaginous fishes, gill slits are separate and without operculum (gill cover). Bony fishes possess gill slits that are covered by an operculum.