19. How did the Song Dynasty contribute to advances in transportation?
By inventing the magnetic compass
20. How did Nerva attempt to improve the Roman economy?
He granted land to help small farmers.
21. Why did the Chinese require the Portuguese to pay for goods in gold and silver when trading?
Portuguese goods were less valuable than Chinese goods.
22. Why did the Chinese silk trade die during the Ming Dynasty?
The Chinese drove the silkworms to extinction by overusing them.
Hope this helps
