Looks to me like that apple and orange are from the same tree.<quoted text>
Sounds like gobbledegook.
Kong gave as a reply apples and oranges.
How do you define your most recent common ancestor?(given the entire alien seeding running as a main theme trough your life.)
LUCA would be found in Carpentras-soil or those of similar constitution to form a fatty cell-wall.
When? Take a huge ballparknumber, but really huge since it involves all life.
So if your question is about time between those events...
The last universal ancestor (LUA), also called the last universal common ancestor (LUCA), or the cenancestor, is the most recent organism from which all organisms now living on Earth descend. Thus it is the most recent common ancestor (MRCA) of all current life on Earth. The LUA is estimated to have lived some 3.5 to 3.8 billion years ago (sometime in the Paleoarchean era).