∙ In viviparous animals, the development of the embryo takes place inside the womb of the mother.
∙ The structure of the body results in the production of young ones. It is developed inside the uterus of the mother. So, fewer offspring are produced per litter.
∙ But in oviparous animals, the development of the embryo takes place outside the mother body in the external environment.
∙ There are many stages for hatching between these time periods; many eggs are broken or do not incubate well.
∙ So, a large number of offspring are produced per litter.