Japan i believe, hope this helped
The first reason is their size. They are very small and are very difficult to see. Special technology needed to be developed in order to observe them and their behavior and reach the conclusion that they were in fact infectious agents that could cause diseases. This wasn't possible before because the microscopes weren't as well developed.
Another is that they have a very long incubation period. This means that if you have them, a long time will pass before they start harming you which meant that many people believed them to be harmless since they couldn't track their behavior over a longer time period, also due to the lack of good technology.
I agree with the other person - the correct answer should be <span> A. The difficulty of running such a large territory.
The Roman Empire was huge - it had many territories in Europe, North Africa, and the Middle East, so it encompassed such a large area that it was too difficult to govern smoothly. This is why it was split into two areas so as to make things easier.
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Please give a list of what "these" are.
In order of first to last based on how they are listed up top 3,2,1,4,5