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The Earth’s Biosphere  
JUST THE FACTS 

Tags: Earth Science, Earth's Biosphere, Earth

The following is a concise list relating to the key elements of the Earth’s biosphere.

	The planet's life forms are sometimes said to form a "biosphere".
	This biosphere is generally believed to have begun evolving about 3.5 billion (3.5×109) years ago.
	Earth is the only place in the universe where life is absolutely known to exist, and some scientists believe that biospheres might be rare.
	The biosphere is divided into a number of biomes, inhabited by broadly similar flora and fauna.
	On land, biomes are separated primarily by latitude.
	Terrestrial biomes lying within the Arctic and Antarctic Circles are relatively barren of plant and animal life, while most of the more populous biomes lie near the Equator.

Lister: Angie
Source: Wikipedia – All text in this list shared under the GNU License

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