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ecosystems

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Term
Definition
biotic factor   Any living or once-living organism in the environment.  
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biome   A large region of land with a distinct climate and certain types of plant and animal life.  
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commensalism   Relationship between species in which one species is helped and the other is unaffected.  
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abiotic factor   Any non-living part of the environment, such as water, sunlight, temperature or air.  
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population   All of the individuals of one species that live in the same space at the same time.  
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population density   Number of individuals in a population that occupies an area of limited size.  
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mutualism   Relationship between two species in which both species benefit.  
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ecosystem   All of the communities in a given area and the abiotic factors that affect them.  
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community   All of the populations of different species in a given area that interact in some way and depend on one another for food, shelter, and other needs.  
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limiting factor   Any biotic or abiotic factor that limits the number of individuals in a population  
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parasitism   Relationship between species in which one species benefits and the other is harmed but not usually  
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organism   A living thing.  
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biosphere   Part of Earth that supports life – the top part of Earth’s crust, all the waters covering Earth’s surface, and the surrounding atmosphere; includes all biomes, ecosystems, communities, and populations.  
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symbiosis   A close relationship between two organisms.  
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species   A group of organisms that can mate and produce offspring that in turn can produce more offspring  
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habitat   An environment that provides the things an organism needs to live, grow, and reproduce  
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carrying capacity   The maximum number of organisms of a particular species that can be supported in a given environment  
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ecology   The study of interactions among organisms and their environment  
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