Biology / Unit 13 Bio 3327 short lesson, about 20 seconds
Oviparity, Ovoviviparity, Viviparity
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The idea
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.
In practice
Most mammals develop viviparously, nourished through a placental connection rather than yolk alone.
Where people slip
Ovoviviparity and viviparity both retain the embryo internally, but only viviparity transfers nutrients directly.
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