What are the best 1980's events to do a research project on, and focus questions relevant to it?

The Chernobyl nuclear meltdown, the challengers explosion and the questions: what could have caused the nuclear meltdown?, what impact did the nuclear meltdown have on the world, what adaptive changes were made to rockets to prevent further explosions, how did the challenger’s demise delay further missions to space.

the correct answer is "c: merchants" and "e. soldiers".

the song dynasty was known as the first government in the world to introduce paper currency. it was also the first chinese government which established a permanent standing navy. finally, the first compass was introduced during this period of government.

all of these innovations heavily affected commerce in a positive way. printed money dynamize commerce within the borders of the empire due to an easier way to quantify value during the trade. the introduction of the compass trade routes to be faster. finally, the introduction of a standing navy regulate trade routes.

regarding military affairs, gunpowder was created during this period. this was a tremendous improvement that was widely utilized by the military in order to innovate in the manufacturing of weapons.