Science Dictionary
biosphere   (bī'ə-sfîr')  Pronunciation Key 
  1. The parts of the land, sea, and atmosphere in which organisms are able to live. The biosphere is an irregularly shaped, relatively thin zone in which life is concentrated on or near the Earth's surface and throughout its waters.

  2. All the Earth's ecosystems considered as a single, self-sustaining unit.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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