AP BIOLOGY

Detailed explanation-1: -Also, it is easier to find mates as the gametes just need to be released and can drift away with wind or water. This results in greater genetic variation. The disadvantages however, are that there is reduced chance of survival from predators and harsh environments.

Detailed explanation-2: -Advantages of Internal Fertilization The probability of successful fertilization is increased. The mates are selective. The chances of dehydration of gametes decreases. The young one is protected against predators and the outside environment and hence chances of survival are increased.

Detailed explanation-3: -Internal fertilization protects the fertilized egg or embryo from predation and harsh environments, which results in higher survival rates than can occur with external fertilization.

Detailed explanation-4: -Generally, the number of eggs laid is strictly proportional to the likelihood of mortality of the offspring. So to maximise the survival rate, frogs create a lot of gametes.