Here's why:
* Carbon and Hydrogen Compounds: Wood is primarily composed of cellulose, a complex carbohydrate made up of carbon, hydrogen, and oxygen.
* Burning: When you burn wood, you are essentially initiating a chemical reaction with oxygen, causing the carbon and hydrogen to oxidize and release energy in the form of heat and light.
While wood is the most common example, other carbon and hydrogen compounds like paper and biomass also fall into this category.