Hmm, let's see, I'll help you "go over" the basic concepts, shall we?
Now let's see ==
"A widespread current model of the evolution of the
first living organisms is that these were some form of prokaryotes, which may have evolved out of
protocells, while the eukaryotes evolved later in the history of life.
[37] Some authors have questioned this conclusion, arguing that the current set of prokaryotic species may have evolved from more complex eukaryotic ancestors through a process of simplification.
[38][39][40]
Others have argued that the three domains of life arose simultaneously, from a set of varied cells that formed a single gene pool.
[41] This controversy was summarized in 2005"
And more, of course. Just in case someone says, "So?" -- the answer is, so--according to science, no one knows what the first living organism was. OR how it came about. I believe cells ARE fascinating. The process of life and dying is fascinating, biologically speaking, that is. But -- no one really knows physically and scientifically HOW life came about or WHAT the first living organism was.
en.wikipedia.org