It is part of the wood itself. Apparently wood is about half carbon. All known living things are made of carbon. https://en.wikipedia.org/wiki/Wood#Chemistry_o

It is part of the wood itself. Apparently wood is about half carbon. All known living things are made of carbon. https://en.wikipedia.org/wiki/Wood#Chemistry_of_wood https://en.wikipedia.org/wiki/Wood#Chemistry_of_wood https://en.wikipedia.org/wiki/Carbon-based_life https://en.wikipedia.org/wiki/Carbon-based_life