The correct answers are map making, compasses, and square sails .
Map making made significant progress during the Age of Exploration (when Europeans were sailing to Asia). Thanks to maps that accurately included North and South America and their separation from Asia, sailors were better able to navigate their way around the globe.
Compasses also helped tremendously. These devices helped sailors to find their bearings and assess what direction they were heading.
Lastly, square sails helped in the process of traveling from Europe to Asia. During this period, caravels became ships developed by the Portuguese. These easily movable ships often used square sails as a means to direct their boat.
It would help if you added the options...
The correct answers are B) death of the emperor and C) invasions.
The two reasons for the fall of the Ming Dynasty were the death of the emperor and invasions.
In the middle of the 17th century, the reserves pf silver considerably diminished in the Ming empire and people started to suffer from hunger. The Emperor did nothing to alleviate the situation and the people got angry at him. The Jurchen people, now called the Manchu, declared war against the Ming Emperor. The leader of the Manchu was Nurhaci. Ming Emperor, Chongzhen, hanged himself, and the combination of this, internal discontent, and invasions, ended the Ming period.
