LUCA

LUCA

A schematic of the two-domain tree, with eukaryotes evolving from endosymbiosis between members of the two original trunks of the tree, archaea and bacteria. Image credit: Weiss et al/Nature Microbiology.

Looking for LUCA, the Last Universal Common Ancestor https://astrobiology.nasa.gov/news/looking-for-luca-the-last-universal-common-ancestor/

The last universal common ancestor between ancient Earth chemistry and the onset of genetics https://pmc.ncbi.nlm.nih.gov/articles/PMC6095482/

Who or what is LUCA? https://www.imperial.ac.uk/news/120606/who-what-luca/

Is there an evolutionary starting point and a primordial organism from which all modern life descended?

4.543 billion years

https://www.nps.gov/subjects/geology/age-of-the-earth.htm

4.603 billion years

https://science.nasa.gov/solar-system/solar-system-facts/

LUCA DNA 4.2 billion years