actually fogs reproduce sexually but in an indirect way because when male frogs attracts female frog they both meet under water the male frog leaves his sperms in water and female frog collets it
internally
externally
internal
That depends on the species you are asking about, mammals fertilize internally and fish externally.
Guppies are fertilised internally they are livebearers.
internally because they need time to hatch them
Amphibians fertilize their eggs externally.
Koalas do not fertilize their young. They fertilize each other (internally) to produce young.
A deer is a mammal, so reproduction is done internally.
Internal fertilization
true
No. Fishes fertilize externally.