organism - a living thing, habitat - place where an organism lives, biotic factors - living parts of an ecosystem, abiotic factors - nonliving parts of an ecosystem, Photosynthesis - process by which plants convert carbon dioxide, water, and sunlight 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, community - all the different populations that live together in an area, ecosystem - the community of organisms that live in a particular area, along with their nonliving surroundings, ecology - the study of how living things interact with each other and 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 causes a population to decrease, carrying capacity - the largest population that an area can support, natural selection - process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest, adaptations - the behaviors and physical characteristics that allow organisms to live successfully in their environments, niche - the role/job of an organism in its habitat, or how it makes its living, competition - the struggle between organisms to survive as they attempt to use the same limited resource, predation - an interaction in which one organism kills another for food, predator - an animal that hunts other animals for food, prey - an organism that is killed and eaten by another organism, symbiosis - a close relationship between two species that benefits at least one of the species, mutualism - a relationship between two species in which both species benefit, commensalism - a relationship in which one species benefits and the other species is neither helped nor harmed, parasitism - a relationship that involves one organism living on or inside another organism and harming it, parasite - an organism that lives on or in another organism and causes harm to it, host - an organism in/on which a parasite lives, succession - the series of predictable changes that occur in a community over time, primary succession - the series of changes that occur in an area where no soil or organisms exist, pioneer species - the first species to populate an area, secondary succession - 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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