 Previously, it was believed that social change resulted from biological adaptations, but anthropologists now commonly accept that social changes arise in consequence of a combination of social, evolutionary and biological influences.There have been a number of different approaches to the study of cultural evolution, including dual inheritance theory, sociocultural evolution, memetics, cultural evolutionism and other variants on cultural selection theory.The approaches differ not just in the history of their development and discipline of origin but in how they conceptualize the process of cultural evolution and the assumptions, theories and methods that they apply to its study.