How did trade influence the spread of the Plague (Black Death)? (I really need help on this im giving 30 points and i'll give to whoever can best explain)

How did shipping routes aid in transmitting the plague? [ Infected rats and fleas made way onto ships in contaminated food and supplies. The plague was also transmitted through rat, work animal, and human waste. Ships could efficiently get to other continents as they sailed the seas.]

Explanation:

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wilsons 14 points

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