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organism a living thing habitat the specific environment that provides the things an organism needs to live, grow, and reproduce biotic factor a living part of an organism's habitat abiotic factor a nonliving part of an organism's habitat photosynthesis the process in which some organisms use water along with sunlight and carbon dioxide to make their own food species a group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce population all the members of one species in a particular area ecosystem the community of organisms that live in a particular area, along with their nonliving surroundings ecology the study of how organisms interact with their environment estimate an approximation of a number, based on reasonable assumptions birth rate the number of births in a population in a certain amount of time death rate the number of deaths in a population in a certain amount of time immigration moving into a population emigration leaving a population population density the number of individuals in an area of a specific size limiting factor an environmental factor that prevents a population from increasing carrying capacity the largest population that an area can support