'A Planetary Mega-Organism' | GenomeWeb

About three billion years ago, life on Earth split into three domains of life—bacteria, archaea, and eukaryotes. Before that life on Earth consisted of a "planetary mega-organism" called LUCA, or the last universal common ancestor, says New Scientist's Michael Marshall. Now, researchers are busy trying to paint a picture of LUCA and determine exactly how it evolved and split into the three domains of life.

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