Also known as viviparous, vivipary, live birth
thumb|An aphid giving viviparous birth, an unusual mode of reproduction among insects In animals, viviparity is the development of the embryo inside the body of the mother, with the maternal circulation providing for the metabolic needs of the embryo's development, until the mother gives birth to a fully or partially developed juvenile that is at least metabolically independent. This is opposed to oviparity, where the embryos develop independently outside the mother in eggs until they are developed enough to break out as hatchlings; and ovoviviparity, where the embryos are developed in eggs th
Viviparity is a reproductive strategy where embryos develop inside the mother's body, with the mother's circulation supplying the nutrients and oxygen the embryo needs to grow until birth. This matters because it's fundamentally different from egg-laying reproduction and allows mothers to protect and nurture their developing offspring internally, which is found in mammals, some reptiles, and certain other animals like some insects.
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胎生(英语:Viviparity;拉丁语:Viviparious,词根来自vivus生命)可用来形容一些动物与植物的繁衍方式,但两者的定义并不直接相关。包括人类在内的哺乳动物一般爲胎生。
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