Asociologist who examines how cities are organized or the migration of human populations is studying:

The right answer is Social Ecology

Explanation:

Social ecology studies how the human social and natural systems interact, how they deal with each other and how they can get well, in order to understand the relationship between culture and nature. It can treat topics like land use and food production, how societies grow, environmental impacts of human activities needed for the society to keep on existing, etc. It has a different view of the human way of living and it tries to mix it with the sustainability process needed to stop destroying our world and find ways to help nature without ending our society

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