I made some last minute edits. I am unsure if the last minute edits were also not sufficient, or I was simply too late to recover the question. Was my last minute edit also not acceptable?
Your original question was impossible to answer, there are far too many possible definitions for "every biological molecule". Even if you could get some answer, it wouldn't really be useful.
Your edited question is a completely different one. From the timestamps it looks like the users that deleted your question probably didn't even see the changed version.
The question about why carbon is so important to biological molecules is probably a valid one. I suspect it is a duplicate, but I'm not sure if it was already asked here or on Chemistry.SE.