Life on Earth has followed an evolutionary trajectory and its story is one of survival through interaction with nature. This has its various shades of wresting food, contesting space, and the natural selection of genes with the twin results of adaptation and exploitation of nature. Part of the survival methodologies has been the clustering into groups, family, clan and tribe. There may be disagreement on the exact unfolding of the human drama but there has been a convergence towards efforts to sustain, rather than destroy, the nature-habitat.
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