What about the migration of primitive people?

Ancient humans could travel far across the shallow sea with islands. This is because: (1) there was a geological era (that is, the Quaternary) when human beings appeared, and the climate on the earth experienced many changes of "ice age" and "interglacial period". At the same time, due to crustal movement, the landform is constantly changing. During the ice age, the sea was shallow and submerged. For example, during the ice age, American Indians moved from the islands in the shallow Bering Strait to Alaska, and then moved south to other parts of North America, Central America and South America. Residents in southeastern Chinese mainland moved to Taiwan Province Province along the small island that has not yet sunk to the bottom of the sea; The residents of Oceania moved there in this way, because the sea was shallow at that time. Today, there are more colorful islands scattered in the southwest Pacific, and the sea between the islands is much shallower than today! (1) We should not underestimate the navigation ability of ancient humans. In fact, primitive people built boats very early-the earliest canoe, of course. But don't underestimate these canoes, because they immigrated to new islands and even the mainland. The above is not nonsense, but based on paleogeology, archaeology, anthropology, linguistics and other materials and research results. Limited to space. If you are interested, you might as well read these books yourself. Supplement: Mr. feng0746 1 has little knowledge of continental drift theory, so he has made such an immodest opinion. According to Wei Gena's "continental drift theory", 300 million years ago, there was only one big "pan-continent" on the whole earth, which began to drift and split from 300 million years ago, but even he thought that at least 3 million years ago, the shape of the continent was the same as today. As for the mainland being completely separated by the sea, it was much earlier, at least 10 million years ago. In front of them, they have been separated by the ocean. May I ask Mr. Feng 0746 1- 4: Where was the "Pan-continent" before the continental drift at that time? If you don't migrate across the sea along the shallow islands, where can you go by land? Moreover, archaeology proves that the earliest human remains discovered in America and Oceania are no more than 20,000 years ago. This shows that they all migrated from other continents. Physical anthropology and ethnology studies also show that American Indians and Mongolians in Northeast Asia belong to the same race, and the aborigines in Oceania islands such as Australia and New Zealand are similar to this. In short, so far, materials and research results show that the indigenous people of America and Oceania migrated from the Asian continent. Moreover, we are discussing scientific issues, which should be well-founded and calm. What does it mean that "the ancients made many canoes, crossed the sea with enough food and died"? Like we're discussing serious scientific issues?