Which four mountain ranges make up the appalachian mountain system? asap

Most countries in the middle east must import a majority of their a. gasoline b. oil c. food d. water

The vegetation that thrives in the tundra is limited to a. mosses, barley, wheat, and corn. b. coniferous trees. c. dwarf shrubs, mosses, lichen, potatoes, and beans. d. mosses, lichen, algae, and dwarf shrubs.

Name the two rivers that run through the fertile crescent. how were the rivers both positive and negative to societies of the fertile crescent?