Prove a Bronze Age story is just that? What a strange request. To do so would mean trespassing into religion and questions about the non-falsibility of God theories and I suspect the Mods would object. Just think of the logistics and how weird to save animals that have since become extinct and, as was pointed out how difficult to load beasts from other continents. Incidentally who were the two sorts of people when one bit of the Bible said that there wereonly one, "the Sons of God saw the daughters of men that they were fair." Genesis 6.2. The whole compendium falls apart under its own internal contradictions.
.....Pangaea....
as I said in another post, I love the irony of explanation.