The theory of natural selection and the survival of the fittest can be used to justify existing inequalities and injustices and may give weight to racism, elitism, domination and exploitation. Darwin's theory only concerned biological evolution; social Darwinism developed afterwards and was short-lived – but the heritage of these two aspects of the theory is paralleled in modern genetic arguments explaining inequalities and the naturally superior nature of some races (such as greater development and achievement in one society or social group as opposed to another).