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The biosphere is the global sum of all ecosystems. It can also be called the zone of life on Earth, a closed (apart from solar and cosmic radiation), and self-regulating system. I think, if we...
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Source: https://writers.stackexchange.com/a/6857 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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> The [biosphere](http://en.wikipedia.org/wiki/Biosphere) is the global sum of all ecosystems. It can also be called the zone of life on Earth, a closed (apart from solar and cosmic radiation), and self-regulating system. I think, if we think in interplanetary terms instead of our little xenophobic terracentric little box, a biosphere can be defined as an entirety of lifeforms forming a closed system - usually inhabiting a planet. A cross-biospheric romance then? Another option would be cross-lifeform but that doesn't really restrict as far apart as much as 'biosphere' but may encompass lifeforms that don't happen to live as parts of biospheres (a unique pan-universal deity?)