Tundra is the youngest of all the biomes. The tundra was formed by a retreating continental glacier only 10,000 years ago. The tundra is also the home of many specially adapted plants and animals found no where else in the world. There are two different types of tundra: arctic and alpine. Both share some of the same plants, animals, and climate, but are located in different areas around the world. Arctic tundra occurs close to sea level in arctic regions in the Northern and Southern Hemisphere. Alpine tundra is found on isolated patches on mountain sides. It can be found in scattered areas from the arctic to as central as North America.