What are the two main types of tundra biomes?

The two main types of tundra biomes are Arctic and Alpine tundra. Arctic tundra is found in the northernmost parts of the world, while Alpine tundra is found in high-altitude mountain ranges. The two biomes share many similarities, such as low temperatures, short growing seasons, and permafrost. However, Alpine tundra can have slightly warmer temperatures due to its higher altitude, and may also differ in terms of the types of flora and fauna that can survive in these harsh environments.