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One-third of the population of Europe died in the Middle Ages largely because rats spread the bubonic plague everywhere. |
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In the Middle Ages, rats carried the bubonic plague right across Europe, thus killing onethird of the population. |
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Rats caused the bubonic plague to spread throughout medieval Europe and, consequently, one-third of the population died. |
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The bubonic plague, which was apparently spread by rats, caused one-third of the population of medieval Europe to die. |
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During medieval times, it is thought that onethird of the population of Europe died from the bubonic plague which was being spread by rats. |