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Which one of the following groups of animals is correctly matched with its characteristic feature without even a single exception ?

A. Reptilia : possess 3 - chambered heart with one incompletely divided ventricle.

B. Chordata : Possess a mouth provided with an upper and lower jaw.

C. Chondrichthyes : Possess cartilaginous endoskeleton.

D. Mammalia : Give birth to young one.

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