How many compounds are in a wooden block

1

Wood is composed of a number of compounds such as lignin, cellulose, water, hemicellulose, etc. The relative composition of wood varies from plant to plant. Unlike a compound, wood does not have a fixed chemical formula. Hence, wood is a mixture. In fact, wood is a heterogenous mixture, since these constituent compounds are mixed unevenly in a given wood sample.

C: plants and animals