How does theme develops?

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Characters contribute significantly to the development of theme in various ways. The characters are the individuals through whose eyes the reader most often observes the story, and so their perception of events creates thematic elements.

Explanation:

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i truly dont know the answer wait i do its 1,3,4

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.