A habitat characterized by a permafrost layer is known as a tundra. This biome is defined by its cold climate, short growing seasons, and a permanently frozen subsoil that limits vegetation. The tundra supports low-growing plants, such as mosses, lichens, and hardy shrubs, which can survive the harsh conditions. This ecosystem is typically found in polar regions and at high altitudes, influencing its unique flora and fauna. The presence of permafrost also affects water drainage and nutrient availability, significantly shaping tundra ecology.