1. Tetrarchy is a term introduced by the Roman Emperor Diocletian that means shared rule.
O absence of rule.
O rule of four.
the Roman Empire was divided into halves.

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Explanation:

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

the deaths of over a million communist soldiers

post-traumatic stress disorder in veterans