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Populations and Communities (Chapter 1) Study Guide Abiotic Biotic Population Community Habitat Niche Immigration Emigration Ecosystem Birth rate Death rate Limiting factor Population density Mutualism Commensalism Parasitism Symbiosis Competition Non-living parts of the ecosystem Living parts of the ecosystem All of the members of one species living in a particular area All of the different populations that live together in one area An environment that provides the things that a specific organism needs such as food, water, and shelter An organism’s particular role in its habitat Moving into a population Leaving a population All of the biotic and abiotic factors in an area The main way a population increases in size The main way a population decreases in size An environmental factor that causes a population to stop growing or decrease in size The number in a species divided by the unit area A relationship in which both species benefit A relationship in which one species benefits and the other is neither helped or harmed A relationship in which one species benefits (parasite) and one is harmed (host) A close relationship between two species that benefits at least one of the species The struggle of two species to occupy a certain niche in an ecosystem Know the following: • How to read a graph and answer question. • Explain the difference between population and community. • Calculate population density. • Classify examples of symbiosis (mutualism, commensalism, and parasitism) by type and explain your choice • Explain why secondary succession usually occurs more rapidly than primary succession • ESSAY: Explain how two different species can share a habitat but not the same niche.