Ecosystem - all interactions between biotic and abiotic factors in a region, Biotope - a region that has uniform environmental condition, Niche - a role of an organism in an ecosystem, Species - organisms that can interbreed and produce fertile offspring, Habitat - living area of a population, Ecotone - the transition area between two biotope, Population - a group of individuals from same species, Community - a group of individuals belonging to more than one species, Biosphere - sum of all ecosystems in the Earth,

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