Q.

The unique mammalian characteristics are 

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a

hairs, pinna and viviparous nature

b

hairs, diaphragm and mammary glands

c

hairs, pinna and four chambered heart

d

pinna, ribs and mammary glands

answer is B.

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Detailed Solution

The unique mammalian characteristics are hairs, diaphragm and mammary glands.

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