All humans are single species with common ancestor.the earliest ancestor of human species of homosapiens can be traced in africa.before past some thousands of years ago we all came from africa.1000s of years ago some of our ancestors left africa while other stayed on as residents spread across the africa.the migrants slowly spread across the planet.from africa to west,east,cental asia from there to europe,america ,australia and other this we can say that all human beings of diferent countries are single species with a commom ancestor
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