Estradiol, or more precisely, 17Î²-estradiol, is a steroid and estrogen sex hormone, and the primary female sex hormone. It is named for and is important in the regulation of the estrous and menstrual female reproductive cycles.n the female, estradiol acts as a growth hormone for tissue of the reproductive organs, supporting the lining of the vagina, the cervical glands, the endometrium, and the lining of the fallopian tubes.
Ethnohistory is the study of ethnographic cultures and indigenous customs by examining historical records. It is also the study of the history of various ethnic groups that may or may not exist today. Ethnohistory uses both historical and ethnographic data as its foundation.
William G. Sumner coined the term ethnocentrism upon observing the tendency for people to differentiate between the in-group and others. He defined it as the technical name for the view of things in which one's own group is the center of everything, and all others are scaled and rated with reference to it..He further characterized it as often leading to pride, vanity, beliefs of one's own group's superiority, and contempt of outsiders.thnocentrism is judging another culture solely by the values and standards of one's own culture.