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:

i hope this helps plz tell me if its wrong so i can fix it :)

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.