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Well, I do know that the animals in Oceania and Australia are different but similar to those on the mainland because they've been isolated so long.

So if a storm picked up some of the finches on the mainland and dropped them into Oceania's islands, they wouldn't have a way back. So they would adapt to their surroundings and through evolution, the would eventually become a different species. People and animals also traveled to these places during the Ice Age.

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