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  All the questions you ask have been answered by scientists over hundreds of years of study and are presented with the necessary evidence in original peer-reviewed research papers and serious educational books.
  
  You don't need a knowledge of Greek and Latin terms to understand genetics and evolution, they are used as an international language to avoid confusion between scientists with different native languages, not to hide anything (although as English is now the international language of science they are needed less).
  
  As for me knowing the periodic table, hard to use the EDAX system on my SEM without such knowledge, I'm sure Wikipedia will explain all!

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