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7.10ABC Organisms, Environments, and Ecosystems

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Term
Definition
ECOSYSTEM   System consisting of all of the interactions that occur between the abiotic & biotic factors within an environment; "eco-" = earth  
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BIOME   1 of the world’s major communities, classified according to the predominant vegetation; characterized by adaptation of organisms to that particular environment.  
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HABITAT   Place where an organism naturally lives & grows.  
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MICROHABITAT   Very small, specialized habitat, such as the space under a rock; "micro-" = small  
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POPULATION   Group of organisms of the same species located within the same geographical location.  
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BIODIVERSITY   Number of different species of plants & animals in an area.  
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ECOLOGICAL SUCESSION   Change in types of species present in a community over time, such as after a disturbance.  
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CLIMAX COMMUNITY   Relatively stable state of succession, or the end product of succession.  
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SUSTAINABLE   Capable of maintaining the current community at a steady level without exhausting natural resources or causing severe ecological damage.  
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ORGANISM   Individual animal, plant, or single-celled life form.  
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BIOTIC FACTOR   Living or once living part of an organism's habitat; "bio-" = life  
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ABIOTIC FACTOR   Non-living parts of an ecosystem such as soil, climate & rainfall; "a-"= not or without  
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TERRESTRIAL BIOME   Large geographic land areas with similar climates & ecosystems; "terra-" = earth  
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AQUATIC BIOME   Various water (fresh & salt) systems that make up distinct communities; "aqua-" = water  
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PRIMARY SUCCESSION   Ecological succession that begins in an area where no biotic community previously existed.  
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SECONDARY SUCCESSION   Succession on a site where an existing community has been disrupted.  
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ENVIRONMENT   The surroundings or conditions in which a person, animal, or plant lives or operates.  
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COMMUNITY   All the different populations that live together in an area.  
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INTERDEPENDENCE   The dependence of two or more living things on each other.  
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TROPHIC LEVEL   Each step in a food chain, food web, or energy pyramid.  
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ADAPTATION   Inherited characteristic that increases an organism's chance of survival.  
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PIONEER SPECIES   First species to populate an area during ecological succession.  
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LIMITING FACTOR   An environmental factor that prevents a population from increasing.  
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DISTURBANCE   An event, such as storm, fire, flood, drought, overgrazing or human activity, that changes a community and alters resource availability.  
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INVASIVE SPECIES   Species that enter new ecosystems and multiply, harming native species and their habitats.  
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EQUILIBRIUM   A state in which opposing forces or influences are balanced.  
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