If any of us could trace our family tree back far enough, right to the very beginning, then we might expect that we should all converge on LUCA, the Last Universal Common Ancestor, the organism from which all life on Earth evolved. But as Addy Pross writes in his book What is Life? (2012), the tree of life metaphor that Charles Darwin introduced may break down once you get as far back as the Bacteria, Archaea, and Eukarya kingdoms.
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