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Chapter 4 Section 2 Vocabulary Biotic factors The biological influences on organisms within an ecosystem. Abiotic factors Physical or nonliving factors that shape an ecosystem . Niche The full range of physical and biological conditions in which an organism lives and the way in which the organism uses those condition. Any necessity of life. A rule stating that no two species can occupy the same niche in the same habitat at the same time. An interaction in which one organism captures and feeds on another organism. Resource Competitive exclusion principle Predation Symbiosis Mutualism Commensalism Parasitism Ecological succession Primary succession Pioneer species Secondary succession Habitat Any relationship in which two species live closely together. Both species benefit from one another. One member of the association benefits and the other is neither helped nor harmed. One organism lives on or inside another harming it. The series of predictable changes that occur in a community over time. Succession that occurs on surfaces where no soil is present. When primary succession begins, there is no soil just ash and rock, the first species to populate the area. When a disturbance is over, community interactions tend to restore the ecosystem to its original condition in this process. The biotic and abiotic factors that affect where an organism lives.