Which pair of characters are found witho...

Which pair of characters are found without exception in all mammals

A

Hair and viviparity

B

Viviparity and mammary glands

C

Viviparity and internal fertilization

D

Mammary glands and internal fertilization

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The correct Answer is:

D

Mammals have characteristic such as mammary gland, presence of hair, middle ear bone, sweat gland, temperature regulation

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