So, I was up late watching Nick News...

[kahljorn]

What about cancer, though? That's a mutated cell which implies parts are missing or distorted, but it still works, just in a different fashion.

I get the idea of it, though, that if it were to evolve into what it is today, at some point it would've had to have been missing some of what it has now, and must've been functional to some degree. I didn't get that at first, my mistake.

However, evolution is complex. Consider it like this:
Perhaps before the cell had different parts, and gradually added different ones on, or the parts themselves changed or upgraded. Which means, through some kind of process of the exchange of various parts, it became what it is today. Which means 70 billion years ago it could've had completely different parts, but through a process it adopted what it has today. Which definitley allows for the possibility of a less complex cell, even missing some or all of the parts it has today.