eli5: How did the people on islands like sentinel island get there? And how have they survived for so long?
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There are two ways that populations spread out — either by land bridges that have since gone back underwater with changing geology, or simply by boat.
It wasn’t necessarily boats the size of Europeans coming to the Americas, but all it takes is a few people in canoes to get to an island to start living there to have large populations a thousand years later.
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