Final answer:
Early Indigenous Australians arrived on the continent by crossing a land bridge that used to exist.
Step-by-step explanation:
Early Indigenous Australians arrived on the continent by crossing a land bridge that used to exist. During the last ice age, when sea levels were much lower, a land bridge known as the Sahul Shelf connected mainland Australia to New Guinea and Tasmania. This allowed for the migration of early Indigenous Australians across the land.
Learn more about Early Indigenous Australians' migration