Answer:Legislative, Judicial, Executive
Explanation:
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.
It would be "a. Johannesburg" that is a regional hub of commerce and has South Africa's premier international <span>airport. In fact, this city acted as a major commerce and trading hub for hundreds of years. </span>
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Geography, including regional differences in soils, rainfall, and growing seasons was the primary cause of economic differences among the colonies in North America. A result of the encounter between Europeans and Native Americans was that new diseases were spread to Native American populations.
