External fertilization

Question

Quizplus · Accepted Answer

External fertilization occurs in some but not all aquatic animals, such as fish, amphibians, and some invertebrates. Terrestrial animals typically use internal fertilization due to the risks of desiccation and limited opportunities for direct contact between gametes. A penis is not necessary for external fertilization, as sperm and eggs are released into the environment. Spermatophores are structures used to transfer sperm during mating, but they are not necessary for external fertilization. Finally, external fertilization is not confined to invertebrates, as some fish and amphibians also use this method.

External Fertilization