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...Darwinism charles darwin s major contribution was not evolution itself but the part of inspiration in development mechanism by which it ns writings economist thomas operated natural malthus who argued that while food selection resources increase arithmetically over time human population grew geometrically thus also discussed leading to an inevitable competition for scarce contemporary alfred russell wallace basic principles change descent with modification said little about humans primary producing origin species there are other mechanisms such as sexual social addressed question later drift man and expressions emotions variability stuff varies animals he heritability variation is passed on genetically were limited related internal biological some variations advantageous securing states accompanied animal tend more than others behaviors associated survival spencer misleading summary fittest reproduction example when fight they bare their after e o wilson still us teeth a threatening ma...