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Populations and Communities

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
organism   A living thing  
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habitat   an environment that provides the things the organism needs to live, grow, and reproduce  
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Biotic factors   the living parts of a habitat  
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Abiotic factors   are the nonliving parts of an organism's habitat  
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Photosynthesis   The process in which organisms use water along with sunlight and carbon dioxide to make their own food.  
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Species   A group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce.  
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Population   All the members of one species in a particular area.  
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Community   All the different populations that live together in an area.  
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Ecosystem   The community of organisms that live in a particular area along with their nonliving surroundings.  
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Ecology   The study of how living things interact with each other and their environment.  
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Estimate   An approximation of a number, based on reasonable assumptions.  
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Birth rate   The number of births in a population in a certain amount of time.  
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Death rate   The number of deaths in a population in a certain amount of time.  
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Immigration   Moving into a population.  
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Emigration   Leaving a population.  
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Population density   The number of individuals in a specific area.  
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Limiting factors   An environmental factor that causes a population to decrease.  
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Carrying capacity   The largest population that an area can support.  
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Nature selecton   A process by which characteristics that make an individual better suited to its environment become more common in a species.  
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Adaptations   A behavior or physical characteristic that allows an organism to live successfully in its environment.  
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Niche   The role of an organism in its habitat, or how it makes its living.  
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Computition   The struggle between organisms to survive as they attempt to use the same limited resource.  
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Predation   An interaction in which one organism kills another for food.  
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Predator   The organism that does the killing in a predation interaction.  
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Prey   An organism that is killed and eaten by another organism.  
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Sumiusis   A close relationship between two species that benefits at least one of the species.  
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Mutualism   A relationship between two species in which both species benefit.  
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Commenalism   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 in a host and harms it.  
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Parasite   The organism that benefits by living on or in a host in a parasitism interaction.  
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Host   The organism that a parasite lives in or on in a parasitism interaction.  
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Succesion   The series of predictable changes that occur in a community over time.  
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Primary succesion   The series of changes that occur in an area where no soil or organisms exist.  
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Pioneer species   The first species to populate an area.  
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Secondary succesion   The series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist.  
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