In which of the following pair, both characters are found without exception in all Mammals?

Hair and external fertilization

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Vivipary and mammary glands

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Internal fertilization and mammary glands

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Vivipary and internal fertilization

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Solution

The correct option is C Internal fertilization and mammary glands
Presence of mammary glands (to feed the young ones) and internal fertilization are the characteristic features of all mammals.
Fusion of male and female gametes within the body is called internal fertilisation. Most of the mammals are viviparous (giving birth to young one) but an exception to this is Platypus. It is an oviparous mammal.

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