Oviparity, Ovoviviparity, Viviparity
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State
In oviparity, fertilized eggs develop outside the body on yolk; in ovoviviparity, eggs develop inside the parent on yolk; in viviparity, offspring develop inside, nourished through a placenta.
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Most mammals develop viviparously, nourished through a placental connection rather than yolk alone.
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Ovoviviparity and viviparity both retain the embryo internally, but only viviparity transfers nutrients directly.