Tylor and Morgan elaborated the theory of unilinear evolution, specifying criteria for categorising cultures according to their standing within a fixed system of growth of humanity as a whole and examining the modes and mechanisms of this growth.
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This approach was more nuanced than White s theory of " unilinear evolution . " Steward rejected the 19th-century notion of progress, and instead called attention to the Darwinian notion of " adaptation ", arguing that all societies had to adapt to their environment in some way.
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