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unitary An individual organism that remains one single unit. modular An individual produces other similar modules or look-a-likes. clone individual that is genetically the same as the parent. distribution the area over which a population covers geographic range the area that encompasses the entire population of a species local subpopulation population associated by a restricted patch of habitat metapopulation set of local subpopulations abundance number of individuals in a population (size) population density number of individuals per unit area random no set pattern of distribution; individuals are independent of one another clumped individuals occur in groups uniform evenly spread out distribution quadrant sampling set sampling unit used to estimate the population size of a large area age structure # or proportion of individuals in different age classes age pyramid provides a picture of relative size of different age groups in a population at a certain time