An ethnographer might utilize the following field techniques in his study, EXCEPT: Group of answer choices Participant observation Interviews The collection of life histories surveys All of these are field techniques that an ethnographer uses

The collection of life histories.

Explanation: An ethnographer is a researcher who studies a particular group of people in an effort to understand them and describe them to others as best they can.

Ethnography entails examining the behavior of the participants in a given social situation and also understanding group members' own interpretation of such behavior.[1] Dewan (2018) further elaborates that this behavior may be shaped by the constraints the participants feel because of the situations they are in or by the society in which they belong. Ethnography, as the presentation of empirical data on human societies and cultures, was pioneered in the biological, social, and cultural branches of anthropology, but it has also become popular in the social sciences in general—sociology,[2] communication studies, history—wherever people study ethnic groups, formations, compositions, resettlements, social welfare characteristics, materiality, spirituality, and a people's ethnogenesis.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.