What was the difference between the ironclads, the monitor, and the merrimac?
a. the merrimac included a revolving gun turret.
b. the monitor included a revolving gun turret.
c. they were the same, designed and built by the same company.
d. the monitor included multiple stations along both sides for rapid fire exchanges.

Correct

B. The Monitor included a revolving gun turret.

The battleship Monitor designed by John Ericson stood out for having an armored rotating turret in which two 11-inch guns were installed. The Battleship Monitor was one of the most innovative ships of all time.

the real answer is b

although the crusades failed to capture jerusalem, they had several major impacts on western europe. they increased the authority of the king: sometimes nobles died in battle without leaving an heir in which case the king got their land. kings passed taxes to pay for the crusades.