Nature is "The Timeless Architect"
If there is a single feature of human beings that has enabled the human to develop civilisation beyond any other species, it has to be the 'division of labour'.
Division of Labour occurs most naturally when the abilities and capabilities of some differ from the abilities and capabilities of others.
The difference between abilities as skills are developed rapidly become massively enhanced by the development of skill. The reason for this is simple: as more skills are developed, the aptitudes of individuals become more tested, and the differentials between the strengths and weaknesses of individuals becomes enhanced. That this leads to division of labour: the division of people into their respective skill sets quickly and naturally leads to arrow-smiths, hunters, and so on to become defined specialties.
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Please also have a look in the The Natural History Museum