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6TH GRADE Chapter 1- section 3 Environmental science vocabulary

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Term
Definition
natural selection   Process by which individuals that are better adapted to the environment are more likely to survive and reproduce than others.  
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adaption   The behaviors and physical characteristics of species that allow them to live successfully in their environments.  
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niche   An organism's particular role in an ecosystem, or how it makes its living.  
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competition   The struggle between organisms for the limited resources in a habitat.  
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predation   An interaction in which on organism kills and eats another.  
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predator   The organism that does the killing in predation.  
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prey   An organism is killed in predation.  
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symbiosis   A close relationship between species that benefits at least one of the species.  
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mutualism   A relationship between two species which both species benefit.  
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commensalism   A relationship between two species in which one species benefits and the other is neither helped nor harmed.  
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parasitism   A relationship in which one organism lives on or inside another and harms it.  
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parasite   The organism that benefits by living on or in a host in parasitism.  
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host   The organism that parasite lives in or on in parasitism.  
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