Why was it so necessary for sailors in the indian ocean to learn about the winds there? what other navigational instruments did chinese and arab merchants have to them sail the indian ocean from 700–1500 ce?

How does nafta affect relations between the united states and canada? a. it bans immigration between the two countries. b. it opens the borders between the two countries. c. it raises taxes on trade between the two countries. d. it allows free trade between the two countries.