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MNB Page 41 The slow changes of organisms that occurs when the environment changes. Plant species The main plants that controls the site. (grow in the largest numbers) 0-20 Primary stage Weeds, grasses, wildflowers, mosses, ferns 20-50 Secondary stage Shrubs, fruit trees, pine trees 50+ Mature stage Hardwood/deciduous forest (Maple, Oak, Sweetgum trees) Wars, farming, construction, fire, mowing, using pesticides Introduction of a non-native species, soil compaction Natural disasters (hurricanes, tornadoes, fire, flood, drought tsunami, and earthquakes) and insect infestations The last community (group of plants) to develop in succession Climate, soil conditions, precipitation levels/type, geography, amount of sunlight Annual Biennial Perennial One year Two years More than two years