What group from Central Asia became much more important thanks to the Silk Road?

Lines of longitude are like stripes from the top of the globe down to the bottom virtually slicing the earth like an orange

Can someone me choose a broad topic and area of focus i am really doing this as a tally to see which one most people pick ok water pollution global warming endangered species atmosphere for the !

In a constitutional monarchy, the king or queen a. is a symbol of the nation b. runs for office c. controls the legislative branch d. has absolute control