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The regions of the universe, especially on the earth, that are capable of supporting life; the biosphere.
(Biology) the planetary ecosystem, consisting of all living organisms and their environment
ec•o•sphere(ˈɛk oʊˌsfɪər, ˈi koʊ-)
1. the part of the atmosphere, from sea level to about 13,000 ft. (4000 m) above, in which it is possible to breathe normally without aid.