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30/08/2020 6:47 pm
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All mammals without any exception are characterized by
(a) viviparity and biconcave red blood cells.
(b) extra-abdominal testes and a four-chambered heart.
(c) heterodont teeth and 12 pairs of cranial nerves.
(d) a muscular diaphragm and milk-producing glands.
1 Answer
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30/08/2020 6:48 pm
(d) a muscular diaphragm and milk-producing glands.
Explanation:
Mammals are characterised by muscular diaphragm and milk producing glands.