desert: an area that receives less than 25 cm of rain per year, , rain forest: forests in which large amounts of rain fall year-round, , grassland: an area populated mostly by grasses and other nonwoody plants, , deciduous forest: a forest of trees that shed their leaves and grow new ones each year , , boreal forest: dense forests found in upper regions of the Northern Hemisphere, , tundra: area that is extremely cold and dry, ,

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