Charles Darwin's theory of evolution by natural selection,as presented in his Origin of Species,presupposed the existence of:

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Darwin's theory of evolution by natural selection relies on the existence of inheritable small individual differences among members of a species. He argued that these variations provide a basis for natural selection to occur, as individuals with advantageous traits are more likely to survive and pass those traits on to their offspring. Darwin did not address inheritable psychological characteristics in humans, and his theory did not assume fixed groups of species, as he believed in the process of speciation through gradual change over time. Therefore, the correct answer is C.

Charles Darwin's Theory of Evolution by Natural Selection,as Presented in His