If an organisms give birth to fully developed young ones they are identified as viviparous. Whereas organism who lay eggs and is hatched in external environment are identified as oviparous. Birds lays eggs and the further development of zygotes occur outside the parents body and when it develops at a certain stage it hatches out. This is an example of oviparous. In case of mammals the zygotes and developed inside females body and when it attains a certain stage of development it is expelled from the female’s body.
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