Humans started to live in cities - 6000 years ago, Earth was one piece of land, called Pangea - 230-280 million years ago, Humans started to walk on 2 legs instead of 4 - 5-7 million years ago, Humans shifted from hunting and gathering to farming - 12,000 years ago, Dinosaurs died out when the earth was hit by an asteroid - 65 million years ago,

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