It’s not like someone was sitting in a tropical island then went ‘welp, time to move to the arctic” people lived at the edge of cold regions, got better and better at dealing with cold and migrated bit by bit. Like no one moved from somewhere it was 80 all day to somewhere the temperature is 5. They moved from a place the temperature was 5 from somewhere it was 6, who had previously lived somewhere it was 7 or something.
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