The CNL, by comparison, is a master's-prepared advanced generalist. Education and preparation are broad with no specialization. Evidence-based practice is assimilated and applied to the microsystem in which the CNL functions.
Tundras are among Earth's coldest, harshest biomes. Tundra ecosystems are treeless regions found in the Arctic and on the tops of mountains, where the climate is cold and windy and rainfall is scant. Tundra lands are snow-covered for much of the year, until summer brings a burst of wildflowers.
The permanently frozen ground in the northern latitudes is called permafrost. The layer closest to the surface that thaws during the summer is also part of the permafrost, but is called the active layer. Permafrost is a major feature of the tundra biome.