How did caravanserai serve as a crossroads of commerce and culture

Select the correct answer. what was edwin hubble's contribution to the field of astronomy? a. he discovered variable stars. b. he proved that the heliocentric model accurately described our solar system. c. he found a relationship between the period luminosity and distance of stars. d. he proved that the universe is finite. e. he discovered that the universe was expanding.

What is the role of boundaries, and how do they function within or between states

How did the nature of immigration to the united states change in the 1990s? a.there were more female immigrants than male immigrants. b.there were more elderly people than children. c.more highly skilled immigrants migrated to the united states. d.immigrants moved farther inland than before. e.there were more immigrants from latin america than ever before.