<span> a revolution in communication occur in the 15th century
The first revolution in communication happened after Johanne Guttenberg developed the first movable printing in 1439, which allow people to easaily write and exchange information from one place to another</span>
A policy to stop the spread of Communism
Natural resources, physical capital, population, human capital,technology, and law
Answer
Persian wheel is useful in mountainous (hilly) areas due to close water level; it is suitable for small scale farming. Disadvantages: Persian wheel can irrigate small areas, lot of effort is needed and it is time taking. Ans: Advantages: (1) Tube well reduces dependence on rain. (2) Tube well speed can be controlled.
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