Which of the following features is incorrect regarding Chondrichthyes?

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They have a cartilaginous endoskeleton They possess an operculum over the gills Correct They have a two-chambered heart They lack a swim bladder

Chondrichthyes (cartilaginous fishes) do not have an operculum (gill cover); it is a feature of bony fishes (Osteichthyes).

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