
I know that the answer to the question "Lignin makes up 15-30% of what structure?" is in "Wood is a heterogeneous, hygroscopic, cellular and anisotropic material. It consists of cells, and the cell walls are composed of micro-fibrils of cellulose (40% – 50%) and hemicellulose (15% – 25%) impregnated with lignin (15% – 30%).". Can you tell me what it is? 


cell walls
