Nature is "The Timeless Architect"
If there is a single feature of human beings that have enabled the human to develope 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 abecomes enhanced. That this leads to divison of labout: the division of people into their respective skill sets quickly and naturally leads to arrowsmiths, hunters, and so on to become defined specialties.
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Please also have a look in the The Natural History Museum