The portion of Earth and its atmosphere that can support life.
The part of the Earth’s system comprising all ecosystems and living organisms in the atmosphere, on land (terrestrial biosphere), or in the oceans (marine biosphere), including derived dead organic matter such as litter, soil organic matter, and oceanic detritus.
The living and dead organisms found near the earth's surface in parts of the lithosphere, atmosphere, and hydrosphere. The part of the global carbon cycle that includes living organisms and biogenic organic matter.
Biosphere has been defined 15 different ways in documents like FRTR Glossary, Climate Change and Human Health - Risks and Responses, Reclamation Glossary, and 7 more.