EXTERNAL
Lions are mammals, and use internal fertilisation.
Marine mammals have internalized genitalia for streamlining.
what two classes of vertebrates use external fertilisation
They use internal fertilisation.
spiders
Most fish use external fertilization. But not all, guppies and other livebearers use internal fertilization. Of the external fertilizers, some are broadcast spawners, whereas others are not.
All mammals use internal fertilization.
Yes they do.
Yes
Internal. Sperm from the bull is ejaculated inside the fornix vagina of the cow and the sperm travel to the fallopian tubes where an ovum is waiting to be fertilized.
yes,sometimes