Neolithic Revolution as irrigation and deforestation which allowed the production of surplus food. Other developments found very widely are the domestication of animals, pottery, polished stone tools, and rectangular houses. These developments, sometimes called the Neolithic package, provided the basis for centralized administrations and political structures, hierarchical ideologies, depersonalized systems of knowledge (e.g. writing), densely populated settlements, specialization and division of labour, more trade, the development of non-portable art and architecture, and property ownership. The earliest known civilization developed in Sumer in southern Mesopotamia (); its emergence also heralded the beginning of the Bronze Age. The relationship of the above-mentioned Neolithic characteristics
Neolithic creolisation hypothesis Neolithic creolisation hypothesis The Neolithic creolisation hypothesis, first put forward by Marek Zvelebil in 1995, contributes to the Proto-Indo-European Urheimat issue and proposes a cultural melting pot in the Neolithic of Northern Europe of foreign Neolithic farmers and indigenous Mesolithic hunter-gatherer communities that resulted in the genesis of the Indo-European language family. The hypothesis holds that the linguistic and cultural influence of the Neolithic farmers was far greater than the persistence of their foreign gene pool. According to Zvelebil, the linguistic influence of indigenous hunter-gatherers predominated, but other archeologists, such as Marek Nowak, favor a scenario compatible to Colin Renfrew's