La ciudad de , en el medio oeste, tiene uno de los puertos de envío más activos y uno de los aeropuertos más activos del mundo.

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Explanation: para what

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.

the answer to your question is,

d. when a child was born.

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