What is meant by biosphere?
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Biosphere, relatively thin life-supporting stratum of Earth's surface, extending from a few kilometres into the atmosphere to the deep-sea vents of the ocean. The biosphere is a global ecosystem composed of living organisms (biota) and the abiotic (nonliving) factors from which they derive energy and nutrients.
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The biosphere is the fourth sphere.biosphere is made up of the parts of Earth where life exists—all ecosystems.
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