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Ecology--Interactions

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Term
Definition
niche   everything an organism does and everything the organism needs in its environment  
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natural selection   responsible for evolutionary changes  
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population   a group of organisms of the same sepecies living in the same area  
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herbivore   organisms that eat plants  
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biotic   the living part of an ecosystem  
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abiotic   the nonliving part of an ecosystemcomm  
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host   organism on which a parasite lives  
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habitat   the place in which an organism lives  
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carnivore   animals that prey upon other animals  
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omnivore   organisms that eat both plants and animals  
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feeding level   the location of an organism along a food chain  
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producers   first feeding level in a food chain  
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herbivores   second feeding level in a food chaing  
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useable energy   decreases as one moves from one energy level to the next energy level  
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competition   interaction in which organisms struggle against each other in obtaining the resources need for life  
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  living organisms that catch, kill, and eat other living things  
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prey    
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symbiosis   a close relationship between two organisms in which one organism lives near, on, or even inside another organism and in which at least one organism benefits  
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commensalism   type of relationship in which one organism benefits from the relationship and the other benefits or is harmed  
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mutualism   interaction between two organism in which both organims benefit is some manner  
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parasitism   relationship between two organisms in which one benefits while the second is harmed in some fashion  
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parasitism example   dog and flea --example  
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mutualism example   bee and flowers--example  
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commensalism   you and the mites living in your eyebrows  
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organism   single living individual  
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species   a group of organisms that can breed and produce viable offspring  
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population   same species in the same place at the same time  
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community   all the populations living in an area and interacting with each other  
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ecosystem   a biological community and the environment it lives in  
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biosphere   all the ecosystems found on earth  
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tolerance limits   Minimum and maximum levels beyond which a particular species cannot survive or reproduce.  
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adaptation   A trait that allows a species to survive more easily and reprod uce.  
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evolution   Inheritance of specific genetic traits that control adaptations, giving a species an advantage in an environment.  
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natural selection   Describes process where better competitors survive and reproduce more successfully.  
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predation   Organism is hunted and killed by another Includes parasites, bacteria, viruses  
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  more than one organism attempting to use same resources  
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divergent   Separation of one species into new species.  
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covergent   Unrelated organisms evolve to look and act alike.  
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habitat   Set of environmental conditions in which a particular organism lives  
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ecological niche   Description of role played by a species in a biological community.  
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Opportunistic Species   Quickly appears when any opening in an ecosystem arises. Many are weeds.  
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pioneer species   Able to quickly colonize new ground where nothing else is growing  
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keystone species   A species whose impact on its ecosystem is especially large and influential.  
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predator   Any organism that feeds directly on another living organism is termed a ________________  
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intraspecific competition   Competition among members of the same species.  
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interspecific competition   Competition between members of different species.  
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sybiosis   Intimate living together of members of two or more species.  
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commensalism   One member benefits while other is neither benefited nor harmed.  
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mutalism   Both members benefit.  
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parasitism   One member benefits at the expense of other.  
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commensalism   Barnacles create homes by attaching themselves to whales. The whales are unaffected.  
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