Ecological-evolutionary theory (EET) is a sociological theory of sociocultural evolution that attempts to explain the origin and changes of society and culture.[1][2] Key elements focus on the importance of natural environment and technological change.[3] EET has been described as a theory of social stratification, as it analyzes how stratification has changed through time across different societies.[4] It also has been viewed as a synthesis of the structural functionalism and conflict theory.[4] Proposed by Gerhard Lenski, the theory perhaps is best articulated in his book, Ecological-Evolutionary Theory: Principles and Applications (2005).[2][5] His major collaborators, Jean Lenski and Patrick Nolan, also are said to have contributed to EET.[5][6]
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