• The biosphere is the global sum of all ecosystems. The two joined words are "bio"and "sphere". It can also be termed as the zone of life on Earth, a closed system, and largely self-regulating.
  • The biosphere is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, geosphere, hydrosphere, and atmosphere.
  • Biosphere is that area where all the other three spheres i.e. lithosphere, hydrosphere and atmosphere meet.