When a person automatically mimics another's emotional expression and begins to synchronize his or her own emotion with the other's in terms of expression, vocalization, postures, and movements, what emotional phenomena has occurred?

"Emotional Contagion"

Explanation:

According to my research in Psychology this is known as "Emotional Contagion". An example of this would be seeing a child crying in pain. This visualization can trigger an unhappy emotion in the observer causing them to cry from emotional pain. These phenomenon can happen to any person with empathy both directly and indirectly.

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which sentences ? that question is incomplete

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.