organism substance portion of organism substance Note - CARO explicitly declares organisms substances to be part of (some) organism. CARO:0000004 Material anatomical entity in a gaseous, liquid, semisolid or solid state; produced by anatomical structures or derived from inhaled and ingested substances that have been modified by anatomical structures as they pass through the body and that does not have inherent 3D shape generated by coordinated expression of the organism's own genome. gross anatomical part