Biosphere
/bˈaɪoʊˌsfɪr/
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Definition
(noun) The part of the Earth and its atmosphere capable of supporting life.
Sentence Examples
The watercourse is to the biosphere what blood circulation is to a human being.
The word biosphere comes from a Greek word meaning "life globe."
CEFR Practice Quiz
The ____ includes all the parts of the Earth where life can exist today.