I have always understood LUCA the way that @Chris_Falter described. I’m puzzled that you had some different idea.
What do you take “traced back” to mean, other than ancestry, or the line of descent?
I have always understood LUCA the way that @Chris_Falter described. I’m puzzled that you had some different idea.
What do you take “traced back” to mean, other than ancestry, or the line of descent?