Topic: For How Many Years Did Life on Earth Consist of Only Single celled Life Forms
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Answers to Common Questions
How many years were single celled organism the only kind of life ...
From the beginning of live up to half a billion years ago ... so a fair estimate would be 4 billion years. Read More »
Source: http://wiki.answers.com/Q/How_many_years_were_single_celled_organ...
What is the evidence that the first life forms on earth were simp...
microfossils A freakin plus Read More »
Source: http://wiki.answers.com/Q/What_is_the_evidence_that_the_first_lif...
How long were single-celled organisms the only life on earth?
prokaryotic cells appeared 4million years ago, eukaryotic cells appeared 2million years later... Read More »
Source: http://answers.yahoo.com/question/index?qid=20070521232837AAm2sTV
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Complex organisms are relatively young in comparison with bacteria, archaea and similar single celled organisms. Here's a timeline from the Timeline of Evolution off of wikipedia. The first living organisms arose 3.8 billion years ago and c...
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Source: http://answers.yahoo.com/question/index?qid=20090919214845AARbYzR
