What causes variation within societies?

Over time, some cultures have evolved into more complex forms of organization and control. This cultural evolution has a profound effect on the patterns of the community. The tribes of hunter-gatherers settled around the food reserves of each season came to establish agrarian villages. Later, the villages grew to become towns and cities. Cities became city-states and nation-states.

That is why we can affirm that changes in societies are due to cultural changes, in some cases revolutions take place, but in others it is people who are gradually modifying their culture.

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.

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