External fertilization is used by frogs, toads and fish. They produce many eggs but not many survive.
external
The 2 fertilisation's are external fertilisation, or internal fertilisation. External fertilisation is the type frogs do.
A toad goes through external fertilisation/fertilization
internal
what two classes of vertebrates use external fertilisation
Yes
this is poo if it can t answer this question
internal is in and external is out fertilisation
Because - external fertilisation is 'left to chance'. There's no guarantee that every egg laid will be fertilised by sperm. Internal fertilisation is much more successful.
arthropods usually have external fertilization
spiders
Yes, They Do.