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Internal fertilization is the union of an egg and sperm cell during sexual reproduction inside the female body. Internal fertilization, unlike its counterpart, external fertilization, brings more control to the female with reproduction. [1]
Internal fertilization is the process of fertilization that occurs inside the body of an individual. It occurs mostly in land animals. For internal fertilization to occur there needs to be a method for the introduction of male sperms into the female reproductive tract.
Internal fertilization is characterized by sperm fertilizing the egg within the female; the three methods include: oviparity (egg laid outside female body), ovoviparity (egg held within female), and viviparity (development within female followed by live birth).
When these animals mate with each other, the egg and sperm meet inside the body, not outside in the air or water. Internal fertilization evolved as a part of the move onto land, as many gametes can't float through the air in the same way they float through water.
Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land. The embryo is isolated within the female, which limits predation on the young. Internal fertilization enhances the fertilization of eggs by a specific male.
Internal fertilization enhances the fertilization of eggs by a specific male. Fewer offspring are produced through this method, but their survival rate is higher than that for external fertilization.
Internal Fertilization. Internal fertilization occurs most often in land-based animals, although some aquatic animals also use this method. There are three ways that offspring are produced following internal fertilization.