All mammals without any exception are characterised by (A) viviparity and biconcave red blood ce...

All mammals without any exception are characterised by
(A) viviparity and biconcave red blood cells
(B) diphyodont teeth and 12 pairs of cranial nerves
(C) a muscular diaphragm and milk producing glands
(D) extra abdominal testes and a four-chambered heart
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