Which one of the following groups of animals is correctly matched with its characteristic featur...
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Which one of the following groups of animals is correctly matched with its characteristic feature without any exception?
(a) reptilia : possess 3-chambered heart -with an incompletely divided ventricle. ,
(b) chordata : possess a mouth with an upper and a lower jaw
(c) chondrichthyes : possess cartilaginous endoskeleton.
(d) mammalia : give birth to young ones.
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