Meaning of ARCHEOZOIC ERA

WordNet Dictionary
	Definition:		[n]  the time prior to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
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	Synonyms:		Archaeozoic, Archaeozoic era, Archean, Archean era, Archeozoic
	See Also:		era, geological era, Precambrian, Precambrian period