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 also enhances the fertilization of eggs by a specific male.Disadvantages of internal fertilization are that there are lesser number of offspring produced at a given TIME because it is sometimes difficult for the male and female to come into intimate contact. Additionally, the risk of sexually transmitted DISEASES also increases.Advantages of External Fertilization It results in increased genetic variations. It produces a larger number of offsprings. The gametes released can drift and therefore it is easy to find mates.Disadvantages of external fertilization include a reliance on water and the large amount of wasted sperm and eggs that never reach a corresponding gamete, even when the organisms releasing the eggs and sperm are in close proximity. Additionally, the eggs released can have no shells, as these would stop sperm.