eli5: How did the people on islands like sentinel island get there? And how have they survived for so long?
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They took boats. People have been sailing around on boats for thousands of years, and when they get to an island, they sometimes set up a permanent settlement there.
Islands can generally support some small amount of people through the locally-renewable resource of fish and other protein from the sea. Many islands are viable for farming and may have other natural resources that can be exploited by a gatherer society.
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