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This is a screen shot of a page about biospheres, part of a larger site called the Natural Perspective created by a pair of amateur naturalists. You can view the site in its entirety at: http://www.perspective.com/nature/index.html, and the biosphere page at http://www.perspective.com/ nature/biosphere.html.
The Biosphere page has a date of revision in its top left corner. As you can see, it has not been revised in nine years. You should probably not use a site like this if you need up-to-date information.
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