All reptiles fertilize internally
No - they fertilise internally.
Cats fertilise internally.
internally
Koalas do not fertilize their young. They fertilize each other (internally) to produce young.
There is no external water source to carry the sperm
yes
The male inserts his 'gonopodium' into the females 'cloaca' and releases his milt (sperm). Her 'ova' (eggs) are then fertilised internally.
Kangaroos fertilise internally. However, development of the tiny joey primarily occurs externally, as it undergoes most of its development in the mother's abdominal pouch.
No, actually there is a third choice. They are ovoviviparous as their eggs develop internally and they bear live young.
No, the platypus does not fertilise its eggs externally.
eggs to fertilise and sperm to fertilise it
The incubate their eggs internally and give birth to live snakes. However, after birth the pairent has nothing more to do with them.