**2.3 Classification according to chemical composition**

The classification of biomass according to its chemical composition can be oleaginous, alcoholic, amylaceous/inulinic, and lignocellulosic. The following is the relation of biomass according to its chemical composition.


In the same way, from an ecological point of view, it is possible to differentiate biomasses of different orders: primary, secondary, and tertiary (**Figures 3**–**5**).
