Tundra
Tundra is a treeless biome found in the Arctic and on high mountaintops, where only short grasses, mosses, and small shrubs can survive the brief summer growing season. Arctic tundra usually has permafrost, a layer of permanently frozen ground just below the surface, though alpine tundra on mountains often lacks it since mountain soils tend to be better drained. It is one of the coldest biomes on Earth, and the tree line, the point past which trees can no longer survive the cold, marks its edge.
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