External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. It is...

unlike its counterpart, external fertilization, brings more control to the female with reproduction. For internal fertilization to happen there needs to...

is an aspect of mating. Many aquatic animals use external fertilization, whereas internal fertilization may have developed from a need to maintain gametes...

sexes and mating types. The original form of sex was external fertilization. Internal fertilization, or sex as we know it, evolved later and became dominant...

finishes with fertilization. Various exceptions to this sequence are possible, including artificial insemination, in vitro fertilization, external ejaculation...

(gámos) 'marriage') is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. Gametes are an organism's reproductive...

acting as an aggregation pheromone. It is likely that most externally fertilizing species (e.g. marine worms, sea urchins) coordinate their sexual behaviour...

Aquatic arthropods may breed by external fertilization, as for example horseshoe crabs do, or by internal fertilization, where the ova remain in the female's...

amphibians exhibit external fertilization of eggs, typically within the water, though some amphibians such as caecilians have internal fertilization. All have...

remain of one sex all their lives and rely on external fertilization. Some molluscs use internal fertilization and/or are hermaphrodites, functioning as both...