Search results
Results from the WOW.Com Content Network
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more
File-Class amphibian and reptile articles of NA-importance (81 P) Pages in category "File-Class amphibian and reptile pages" The following 81 pages are in this category, out of 81 total.
Category talk:Early Cretaceous reptiles of Australia; Category talk:Early Cretaceous reptiles of Europe; Category talk:Early Jurassic plesiosaurs of Europe; Category talk:Early Jurassic reptiles of Europe; Category talk:Early Triassic reptiles of Europe; Category talk:Endemic amphibians of Mexico; Category talk:Endemic amphibians of the Iberian ...
In animals, the process involves a sperm fusing with an ovum, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilization, or outside in the case of external fertilization. The fertilized egg cell is known as the zygote. [2] [5]
A. Portal talk:Amphibians; Portal talk:Amphibians and reptiles; Portal talk:Amphibians and reptiles/Selected article; Portal talk:Amphibians and reptiles/Selected article/1
[2]: 2 According to David B. Dusenbery all the features with internal fertilization were most likely a result from oogamy. [7] It has been argued that internal fertilization evolve because of sexual selection through sperm competition. [8] In amphibians, internal fertilization evolved from external fertilization. [9]
[1] [2] Intromittent organs are found most often in terrestrial species, as most non-mammalian aquatic species fertilize their eggs externally, although there are exceptions. For many species in the animal kingdom, the male intromittent organ is a hallmark characteristic of internal fertilization .
A cross between a toad, Amietophrynus regularis, and a frog, Rana fusca, would not produce a viable embryo, but fertilization of a toad egg by an irradiated frog sperm would produce a haploid larva. [1] Parthenogenesis has also been induced in Pelophylax nigromaculatus by pricking an egg with a needle. [2]