Which describes a pattern without explanation?
theory
observation
law
inference

law

Explanation:

law

Explanation:

probably 3 since archeologists and historians don’t understand there writing.

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.