According to the developed by urban sociologists chauncey harris and edward ullman, cities do not have one center from which all growth radiates, but rather have numerous centers of development based on specific urban needs or activities.
a. the sector model
b. social area analysis
c. multiple nuclei model
d. sector model

Multiple Nuclei Model

Explanation:

According to my research on the different studies conducted by Chauncey Harris and Edward Ullman, I can say that the term developed being described by the information given in the question is called the Multiple Nuclei Model. This model explains that cities do not have a single nucleus but many separate nuclei each of which is its own growth point.

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answer; /// i do believe that the correct answer is (d) majority vote as an approval requirement;

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.