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Line 1: − *a true [[organism]] is a responsive, growing, autonomously replicating self-sufficient agent with a [[metabolism]] [http://www.uq.edu.au/vdu/BasicsVirusesAlive.htm]+
Added fact and reformated
'''Life''' is a true [[organism]] is a responsive, growing, autonomously replicating self-sufficient agent with a [[metabolism]]. <ref>http://www.uq.edu.au/vdu/BasicsVirusesAlive.htm</ref> Life has existed on Earth for 3.5 billion years.
[[category: biology]]
[[category: biology]]