When several students are assigned to do a group presentation, only three of the four actually do the required work. A social psychologist would refer to this as social

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.

answer; archaeologists;