Hi, what’s the difference between a continent , country and region?

How would i answer this for an exam?

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.

At first after world war ii, japan’s factories produced goods that were used by the japanese government poorly made toys and novelties high-quality cameras inexpensive motorcycles