Last universal common ancestor

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 The Last Universal Common Ancestor, or LUCA, is the name given to last common ancestor of Earth's current life. It is believed to be the first living organism from which both Prokaryotes and Eukaryotes decended. 

Multiple hypothesises try to answer the question as to how LUCA came to life. The current most accepted suggestion to this is the RNA world hypothesis[1]


References:

  1. Hartl DL, Ruvolo M. Genetics: Analysis of genes and genomes. Eight edition, Burlington: Jones & Barlett Learning
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