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
Mosquitoes have **internal fertilisation**. The male mosquito transfers sperm to the female during mating, and the eggs are fertilised **inside the female’s body**. After that, the female lays the fertilised eggs in water, where they hatch and grow. So yeah, fertilisation happens inside—but the development (eggs → larvae → adult) happens outside in water.
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.