The vast majority are externally fertilizer although there are exceptions eg. the spiney dogfish.
Internal fertilization is where the egg is fertilized inside the body(such as humans) and external fertilaztion is where the an egg is laid and then fertilized. Such as in fishes!
Reptiles and birds are among the major groups of vertebrates that have internal fertilization and external development. Also included are monotremes and marsupials.
internal external not internal external not
its internal
Is a salmon internal or external?
What is internal and external sources?
internal
external
External. Internal devices would be something like a CD Drive, while an external device is a keyboard or mouse for example.
internal is in and external is out
internal is in and external is out fertilisation
Internal and external? 4real