![]() Because of her higher investment, if a female mates with a male of poor genetic quality, and her offspring don’t survive as a result, she has wasted a lot of energy and resources and ended up with nothing. Why do you think this is? Generally females invest more energy, care, and time in the offspring than a male does, and she has a limited number of eggs compared to practically limitless sperm produced by males of most species. “Females are choosy, while males are not” is a gross generalization, but biologically it tends to be true across most species that reproduce sexually, whether they reproduce with internal or external fertilization. Fewer offspring are produced through this method, but their survival rate is higher than that for external fertilization. ![]() ![]() Internal fertilization also increases the likelihood of fertilization by a specific male. In many instances, the embryo is isolated within the female, which limits predation on the young. Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land. This occurs in most mammals, some cartilaginous fish, and a few reptiles. The offspring develops in the female and is born alive.
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