Don't confuse the Talmud with the Torah. The Talmud is the oral law written down, with commentary. It was written because they feared the oral law, which was supposedly also handed down with exactitude (no proof of this) would get lost due to war and death of those who knew it before they could hand it down to the next generations.
The Torah is the written law and so far, the notion that it has been handed down exactly verbatim is supportable - at least, there is evidence of it, while there is no evidence of any significant changes. They are, in most cases, exact replicas even including the shapes of the hand written letters. (all Torah scrools are hand written)
Yes it is possible it is not the whole work, or a compilation of works, but whatever it is it has pretty much been copied again and again, by hand, with exactitude for thousands of years.
ABSOLUTELY!