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Mammalia : Give birth to young ones
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Solution
The correct option is C Condrichthyes : Possess cartilaginous endoskeleton Reptiles usually possess 3-chambered heart but crocodiles are an exception with 4-chambered heart.
Not all chordates have a mouth with upper and lower jaw. Example - class Cyclostomata.
Egg laying mammals include duck billed platypus.
Chondrichthyes (cartilaginous fishes) are the fishes that have cartilaginous endoskeleton. There is no exception to this.