(1) In ovovivoparous species, the young develop inside eggs within the mother's body. The nourishment is provided by the yolk of the egg. The young hatch inside the mother's body and pass out through the anus.
(2) In viviparous species,
the young develop without egg inside of the mother's body. The young are nourished by secretions of the
female or through an umbilical-like cord.