What is one of the 5 major eco systems in the us?

Food | including seafood and game), crops, wild foods, and spices.

Raw materials | (including lumber, skins, fuel wood, organic matter, fodder, and fertilizer)

Genetic resources (including crop improvement genes, and health care)

Water purity.

Biogenic minerals.

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.

hey there! these are the answers.

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