Yet, humans had colonized nearly all the ice- free parts of the globe by the end of the Ice Age, some 1. A Textbook Of Geology By P K Mukherjee Files Free Parts Of In the last quarter- millennium, the rates of growth of population, knowledge, technology, communications, commerce, weapons destructiveness and environmental degradation have greatly accelerated, creating opportunities and perils that now confront the planets human communities. The growing complexity of human societies necessitated systems of writing and accounting. Labour divisions then led to the rise of a leisured upper class and the development of cities. Nomadism continued in some locations, especially in isolated regions with few domesticable plant species. The latter period marked a change in human history, as humans began the systematic husbandry of plants and animals. The roots of civilization reach back to the earliest introduction of primitive technology and culture, while Prehistory begins in the Palaeolithic Era, or.
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