Another word for communicable diseases is .

vector
epidemic
infectious
indirect contact

Another word for communicable diseases is infectious.

Explanation:

infectious means (of a disease or disease-causing organism) likely to be transmitted to people, organisms, etc., through the environment.

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; the sons of liberty;