It is a shame to have come all this way only to find out that Evopeach doesn't understand Darwin's falsification statement. If we had known this earlier I'm sure that someone could have set him straight.
Darwin's statement was, essentially, that his theory (of common descent through small modifications) would be falsified if it could be shown that there is any complex
organ in any species which could not have arisen from earlier precursors through small modification. The presence of carbon in living species is
not an organ in any sense of the word, and so Darwins statement does not apply to it.
At any rate, the importance of carbon as a building material in all life
can be explained by the theory of evolution by postulatiing that carbon was an important material in the first ancestral organisms; then the importance of carbon in present life is simply explained as the chemical heritage of our common ancestor.
The use of carbon in life in no way provides a refutation of the theory of evolution.