Replication of a research study is most likely to be facilitated by

Replication of a research study is most likely to be facilitated by "operational definitions".

An operational definition is the verbalization of operationalization utilized in characterizing the terms of a procedure expected to decide the idea of a thing or phenomenon. For instance a person who is researching estimating bliss and dejection in understudies chooses to utilize a ten-question satisfaction scale to quantify inspirational standpoint in her subjects. At the end of the day, her operational definition of bliss for this situation is a given subject's score on the test.

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.

a would be the answer