Originating in central Asia, the Black Death was carried by

The Black Death is thought to have originated in the arid plains of Central Asia, where it then travelled along the Silk Road, reaching the Crimea by 1346. It was most likely carried by Oriental rat fleas living on the black rats that were regular passengers on merchant ships.

Explanation:

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randy pausch was a famous mathematician, writer and lecturer who is particularly famous for his last speech, given in 2007, "the las lecture", because he illustrates why one's dreams need to be pursued in a logical order if success is to be obtained, option c. at this time, pausch had been diagnosed with terminal cancer so he told the audience to follow their childhood dreams, which were possible to achieve. it has been recognized as one of the best motivational speech around the world.