If you are looking at a map of the United States, you will see clear outlines of each state. These boundaries and borders create which kind of regions across the country? a functional
b. formal
c. vernacular
d. perceptual

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.