Major Land Biomes . They contain more plant and animal species than any other community. Competition is strong for light, soil is poor due to the rapid recycling of nutrients. Animals are mostly tree dwellers. Soil is generally porous with a thin humus layer.
Frequent fires inhibit invasion of trees.
Hot deserts occur in S.W. USA, W. South America, North Africa, Middle East, Central Australia. Reptiles and seed eaters are common. Cacti and succulents are also common. Found in the interior portions of the continents. They are covered with grass and small leafy shrubs.