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Vocabulary #4 1. Ecology - scientific study of interactions between organisms and their environment 2. Parsitism - symbiotic relationship in which one organism benefits at the expense of another, usually another species. 3. Ecosystm - interactions among populations in a community, the community's physical surroundings or abiotic factors. 4. Niche - role of position a species has in its environment; included all biotic and abiotic interactions as an animal meets its needs for survival and reproduction. 5. Habitat - place where an organism lives out its life. 6. Symbiosis - permanent, close association between two or more organisms of different species. 7. Mutualism - a symbiotic relationship in which both species benefit. 8. Biomas - the total mass or weight of all living matter in a given area. 9. Autotroph - organisms that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients. 10. Population - group of organisms all of the same species, which interbreed and live in the same, place a t the same time.