I recently watch a video about the Webb telescope looking back in time to the very beginning.
I’m trying to define existence with terms that are generally agreed upon, with my own additions.
At first there were two kingdoms, the plant kingdom, and the animal kingdom. Carl Linnaeus in 1735 created the non-living kingdom of minerals.
In 1866, Ernst Haeckel created a third living kingdom called Protista, or primitive forms.
In 1938, Herbert Copeland created a fourth living kingdom called Monera, basically bacteria.
In 1969, Robert Whitaker proposed a fifth living kingdom of fungi.
Since then the Kingdom of Monera has been split creating six living kingdoms, and another kingdom created called Chromista. Then everything changed again.
Because biology is only interested in living things the kingdom of minerals has disappeared.
Now the top classification is Domain, where there are three categories, 1) Archaea, 2) Bacteria, and 3) Eukarya. Archaea domain has one living kingdom (archaea), Bacteria has one living kingdom (bacteria), but Eukarya has four living kingdoms (plant, animal, fungi, protista)
Except for the virus, which is neither living or dead. It could be the fourth domain of Zombi, with the seventh kingdom of Zombi. They have some characteristics of living, and some characteristics of the dead.
I’m adding back the kingdom of minerals, which probably should be the fifth domain with a kingdom of earth minerals, then a kingdom on non-earth minerals (dark matter, plasma?, black holes). Possibly a domain of Vacuum? Kingdom of Nothing?
I think that covers it. Six domains, ten kingdoms.
Not sure where alien, “non-human biologics” fits in.