Amphibians undergo external fertilization and need to do this in the water. Both the male and female amphibians release their gametes close to each other after which fertilization will take place.
external because they can change over time.
what two classes of vertebrates use external fertilisation
spiders
external
The 2 fertilisation's are external fertilisation, or internal fertilisation. External fertilisation is the type frogs do.
Yes
Yes.
yes,sometimes
A toad goes through external fertilisation/fertilization
internal
Yes
Lions are mammals, and use internal fertilisation.