Yeah. From what I recall from uni classes on this ten years ago (so we might well know more now) that couldn’t be totally ruled out for the very earliest forms of life but we are as certain as we could be about bacteria just being one tree, and likewise for archaea&eukaryotes.
The only exception would be if life had evolved more than once on earth, which is totally possible but we would probably be able to tell.
Yeah. From what I recall from uni classes on this ten years ago (so we might well know more now) that couldn’t be totally ruled out for the very earliest forms of life but we are as certain as we could be about bacteria just being one tree, and likewise for archaea&eukaryotes.