To estimate the strength of the relationship between birth order and achievement motivation a researcher would do a study

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.

they produces sugar..

hope this , question was a little open ended

answer; society;