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Copernicus created the mathematical theory to prove that the Sun, not the Earth, was the centre of our solar system. Galilei provided the calculations and obser
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History, Politics & Society



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How do you use primary source and secondary source in a paragraph?

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Primary and secondary sources are fundamental in research and academic writing. Primary sources are first-hand accounts or original materials directly related t
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History, Politics & Society








Who did Marco Polo visit on his trip to China?

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