Final answer:
The black material on a charred candle wick is a compound of all living matter and fossil fuels. It is formed through the decomposition of organic matter and the transformation of biomass into coal, oil, and natural gas.
Step-by-step explanation:
The black material on a charred candle wick is a compound of all living matter and fossil fuels. It is formed when organic matter undergoes decomposition and is subjected to high pressures and temperatures over millions of years. This process transforms the biomass of dead plants and animals into fossil fuels like coal, oil, and natural gas.