Which of the following is not a characteristic of class chondrichthyes? (a) Gill slits are separ...

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Which of the following is not a characteristic of class chondrichthyes?
(a) Gill slits are separate and without operculum
(b) They are predaceous
(c) Airbladder is present
(d) Notochord is persistent throughout the life
Shark, Torpedo (Electric ray) and Trygon (Sting ray) are cartilaginous fishes and belong to class
(a) Cyclostomata
(b) Chondrichthyes
(c) Osteichthyes
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