What is structure A? How does it function?

Structure refers to something's form, makeup or arrangement. Function refers to something's job, role, task, or responsibility. Determine means to cause, direct, govern.

Explanation:

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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.