No, they aren’t. With the number of bacteria that have lived over the course of life on Earth, compared to the number of non-bacterial life forms over that time, I would guess that the vast majority of organisms alive now have never been anything other than a bacteria.
These odds aren’t promising either.
No, they aren’t. With the number of bacteria that have lived over the course of life on Earth, compared to the number of non-bacterial life forms over that time, I would guess that the vast majority of organisms alive now have never been anything other than a bacteria.