I'd like to say that although I've been lurking on the boards for a while I've discovered that actually posting makes it an entirely different experience. For one thing, trying to respond to multiple messages in the same thread is hard enough. Managing different messages in different threads is even harder. As a newbie to TrekBBS I fear I may have bitten off more than I could chew. If I've come across as rude or abrupt I do apologize. I fear it'll take me a while to get my board legs.
I hope I'm not missing it again but what I was trying to say was that the concept of merging two people into ones isn't necessarily a scientific one. Imagine a fantasy story where a spell goes wrong instead of a transporter accident. They manage to come up with a spell that CAN separate the tow people but the same question comes up, SHOULD they? That's the crux of the story of Tuvix. It doesn't matter how they're combined. What matters is what the Captain & crew do once they are. The science doesn't enter into it, at least from my perspective. And really, a plant causes the transporter to merge two people? It may work for some people and that's fine but I just accepted it as being the same class of storytelling shorthand as the magnetic ore from The Enemy Within. It's not important how it happened but what happens afterwards.