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The Adaptive Rationale
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according activity adaptive aggression animals appear attack battle become behavior benefits biological called causes chimpanzees civilization coalitions competition complex concept conflict considered contest cooperation costs cultural Darwin death defense early economic effect enemy evidence evolution evolutionary evolved example existence expected explain fact factors females feud fighting fitness force function hostility human hunting idea important increase individual interest intergroup internal involved killing kind lead least less living males material means military motives natural natural selection observed occur organization origin patterns peace political population possible practice present primitive probably races raiding reason regarded relatively reproductive result seems selection sexual similar social societies sometimes species strategy struggle success suggests territorial theory tribes types violence warfare warlike warriors wars weapons women