When I was a kid in Michigan in 1963 I had a beautifully illustrated, wonderful science book that showed the earliest evidence of life as single celled organisms, and I wondered then if and how those cells merged to become complex organisms. Once again it seems that the mitochondria in our cells and those of most life on the planet are actually prehistoric bacteria assimilated a very long time ago.
http://www.spacedaily.com/reports/An_Answer_To_Another_Of_Life_Big_Questions_999.html
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