A) viviparity and biconcave red blood cell
B) extra abdominal testis and four-chambered heart
C) heterodont teeth and 12 pairs of cranial nerves
D) a muscular diaphragm and milk producing glands
Correct Answer: C
Solution :
In mammals, the teeth are heterodont, i.e. dentition consists of incisors, canines, premolar and molar; and thecodont (in sockets of jaw bones). The brain has 12 pairs of cranial nerves in all mammals.
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