Viviparity
Development of the embryo inside mother / From Wikipedia, the free encyclopedia
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Among animals, viviparity is development of the embryo inside the body of the mother. This is opposed to oviparity which is a reproductive mode in which females lay developing eggs that complete their development and hatch externally from the mother.[1]
Development of the embryo inside mother

The term 'viviparity' and its adjective form 'viviparous' derive from the Latin vivus meaning "living" and pario meaning "give birth to".[2]