biosphere

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bi·o·sphere / ˈbīəˌsfi(ə)r/ • n. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.DERIVATIVES: bi·o·spher·ic / ˌbīəˈsfi(ə)rik; -ˈsfer-/ adj.

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