What was the biggest cause of the Black Death?

Basically dirty conditions, no running water, and people rarely took baths or showered. That is also how the disease spread super quickly.

Explanation:

Rats and fleas

Explanation:

The black death started around 12th century and started because of boats. Why because rats were aboard the boats and when the ship landed at Europe shores a ton were found dead. The rats where infected with fleas and they were all over Europe. Thats how it started. I hope this was helpful

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the answer is hope this you.