What factors shipping become so important to the economy of the middle colonies?

The Middle Colonies had lots of fertile soil, which allowed the area to become a major exporter of wheat and other grains. The lumber and shipbuilding industries enjoyed success in the Middle Colonies because of the abundant forests, and Pennsylvania saw moderate success in the textile and iron industry.

answer; ///i believe the correct answer is (b) the writing of the ancients who lived in india after the indus valley inhabitants died out;

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.