In order to understand the unusual behavior of an adult client, a clinical psychologist has carefully investigated the client's current life situation and his physical, social, and educational history. which research method has the psychologist employed?

Case study

Explanation:

Case study is known to be a type of research method which aims to do a comprehensive investigation and analysis of a subject or person, situation and so on. With the use of this method, comprehensive observations can be made by researchers and it can be carried out with tools such as observations, artifacts, interviews, survey and so on. Thus, it is a research method which is popularly used by social scientists.

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.