alleryCartilaginous skeleton, placoid scales and gill slits without opercula identify:
AOsteichthyes
BCyclostomata
CChondrichthyes
DAmphibia
Answer & Solution
Correct answer: C. Chondrichthyes
Chondrichthyes have a cartilaginous endoskeleton, placoid scales and separate gill slits without opercula. Their mouth is ventral and air bladder is absent. Males bear pelvic claspers for internal fertilisation.
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