Human needs are not uniform all over the world. Over the years, they have grown and become more complex with the progress of human society. In very developed societies, people use a variety of highly processed products. On the other hand, in developing countries, the consumption of processed items is much less; while primitive communities like the pygmies in Africa hardly use any processed items.The level of technology also influences the utilization of resources. For example, the prairies of North America were inhabited by the American Indians who used the Prairies as hunting grounds. Later when the European settlers arrived, they used the Prairies for agriculture. Today the Prairies are famous for the cultivation of wheat and the rearing of animals on a commercial basis.