How did sultan mehmet ii adopt new technological advances in his siege of constantinople? (1 point)
a) he dragged his ships overland.
b) he used gunpowder artillery.
c) he laid a chain across the mouth of the golden horn.
d) he laid ladders against the walls of the city.

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

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.