During the 1920s and 1930s, sociologists interested in urban life developed an approach to the study of cities called

The study of cities in the 1920s and 1930s by sociologist was done through the approach of urban ecology

Explanation:

urban ecology as seen in sociology: is the study of community structures and settlements as can be found in cities and densely populated settlements hence sociologists interested in urban life had to use this approach

urban ecology