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Earth's biosphere is described as

User Yogesh Patel
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The biosphere is sometimes thought of as one large ecosystem—a complex community of living and nonliving things functioning as a single unit. More often, however, the biosphere is described as having many ecosystems. People play an important part in maintaining the flow of energy in the biosphere.
User Eric Dauenhauer
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the zone of life. The sum of all life on Earth.

User AaronLS
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