Wood is a hard, fibrous, lignified structural tissue produced as secondary xylem in the stems of woody plants, notably trees but also shrubs. This tissue conducts water to the leaves and other growing tissues and has a support function, enabling plants to reach large sizes. Wood may also refer to other plant materials and tissues with comparable properties. Wood is a heterogeneous, hygroscopic, cellular and anisotropic material. Wood is composed of fibers of cellulose (40%?50%) and hemicellulose (15%?25%) impregnated with lignin (15%?30%).[LINK: http://www.extension.umn.edu/distribution/naturalresources/components/6413ch1.html] Lesson 1: Tree Growth and Wood Material at University of Minnesota Extension , The Netherlands]] can use wood to create delicate sculptures.]] floor (parquetry).]] Wood has been used for millennia for many purposes. One of its primary uses is as fuel. It is also used as