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2 answers

About 2 billion years.

2007-08-19 14:45:56 · answer #1 · answered by Joan H 6 · 0 0

According to: http://www.talkorigins.org/origins/geo_timeline.html

Prokaryotic cells evolved about 3500-2800 MYA
and the first Eukaryotic cells: 1500MYA

If you are really into the evolutionary stuff, this timeline should interest you it is quite detailed.

2007-08-19 21:09:18 · answer #2 · answered by Anonymous · 1 0

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