Talking about cells reproducing, Rudolf Virchows actually made the cell theory.
The cell theory is a set of ideas basically saying how cells come from pre-existing cells/reproduce, and that we descend from something called bacterium.
What's the cell theory?
Oh ok, so what i'm getting at is, this all happened over time, not all at once
As time went by, we developed more and more technology, meaning we had more resources, because of that, more and more things would change. Like i said earlier, people used to believe that nonliving things could give life, but as time went by, it was more and more obvious that it couldn't, and there were more and more ways to prove it couldn't.
Yes! All of this happened over time.
Ok then, it all makes sense now! In conclusion, cells come from pre-existing cells, all living organisms are made of cells, and this was all formed little by little over the years.