Animals which live in the water can mate using external fertilization, where the eggs and sperm are released into and combine within the surrounding water.
22.
On the other hand, he suggested that since external fertilization occurs when the female deposits her eggs, the male has a much greater paternity confidence.
23.
Although paternal care is normal in teleost fishes with external fertilization, it is the mothers in this species that guard and care for eggs until they hatch.
24.
Many animals that live in water use external fertilization, whereas internal fertilization may have developed from a need to maintain gametes in a liquid medium in the Late Ordovician epoch.
25.
Banded killifish are commonly observed to spawn in dense aquatic vegetation because they practice external fertilization where the female lays her eggs that are equipped with adhesive threads that adhere to plants.
26.
The relationship with other molluscs, however, is apparent from some features of the digestive system; aplacophorans possess both a radula and a hermaphroditic, but caudofoveates have two sexes, and reproduce by external fertilization.
27.
About 14 % use a similar external fertilization but produce yolk-rich eggs, which reduce the time the larva needs to spend among the plankton, or eggs from which miniature adults emerge rather than larvae.
28.
The "'Tanganyika killifish "'( " Lamprichthys tanganicanus " ) is a species of poeciliid SL . It is an egglayer with external fertilization, and deposits its eggs in narrow crevices.
29.
Internal fertilization with many vertebrates ( such as reptiles, some fish, and most birds ) occur via cloacal copulation ( see also hemipenis ), while mammals copulate vaginally, and many basal vertebrates reproduce sexually with external fertilization.
30.
Where as most Ctenophores are hermaphroditic, certain platyctenids have been found to be asexual, and furthermore, where other Ctenophores have been found to reproduce using external fertilization, certain species of platyctenids have been found to use brood pouches.
