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BIOMES OF THE WORLD, (the areas where the subsoil is permafrost, or…

- - - - Arid environment.
      - Extreme temperatures.
      - High wind velocity.
      - Sparsity of cloud cover.
      - Absence of water vapour in air.
- - - - Vegetation structure that is dominated by grasses.
      - Semi-arid climate.
      - Rainfall and soils insufficient to support significant tree growth.
      - Most common at mid-latitudes and near the interiors of continents.
      - Grasslands are often exploited for agricultural use.
- - - - CHARACTERISTICS
        
        largest and most complex terrestrial biome.
        
        dominated by trees and other woody vegetation.
        
        significant role in the global intake of carbon dioxide and production of oxygen.
        
        threatened by deforestation for logging, agriculture, and human habitation.