We learn how to act in ways appropriate to our roles within structures. This process of socialization literally means to be 'made social'. It begins at birth and continues until death. Acculturation refers to the diffusions of cultural patterns between two societies in which, generally, one dominates the other. Ethnocentrism is the opinion that one's way of life, one's philosophy, one's culture is correct, and in fact the only true way of being fully human.
Theory is the core of anthropology.
The theoretical frameworks anthropologists adopt will determine the type of questions they ask and the sort of data they collect in their fieldwork. Social evolutionism is a theory which was developed by 19th century thinkers. There were several differences among social evolutionists, however all believe that social evolution was progressive, that cultures would evolve from simple to more complex states. H. Spencer, E. Tylor, H. Morgan were social evolutionists. Functionalism emerged at the turn of the 19th century.