A diagram of the three domains (Bacteria, Archaea, Eukarya) proceeding from the Last Universal Common Ancestor would show Archaea

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The three domains (Bacteria, Archaea, Eukarya) are believed to have evolved from a single organism, the Last Universal Common Ancestor (LUCA). Based on genetic and biochemical evidence, it is thought that Archaea and Eukarya are more closely related to each other than either is to Bacteria. Therefore, a diagram of the three domains proceeding from LUCA would show Archaea branching off the Domain Eukarya, indicating that they share a more recent common ancestor.

A Diagram of the Three Domains (Bacteria, Archaea, Eukarya) Proceeding