Is ethnicity always and exclusively an inherited form of identification?

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Q: Is ethnicity always and exclusively an inherited form of identification? Please write up to 1925 words(without ref list included). Please back up information using Harvard style in-text citations and a reference list at the bottom. Please write referring mainly to the two articles attached in addition to a few scholarly resources. Barth, Fredrick (ed.) (1969). ‘Introduction,’ in F. Barth, Ethnic Groups and Boundaries: The Social Organisation of Cultural Difference. Boston: Little, Brown and Company, pp. 9-38. Harrison, Simon (1999) ‘Identity as a scarce resource,’ Social Anthropology, 7(3): 239-51. The paper should be 1925 words long