al atoms. Removal of any atom transforms this molecule from one substance into another. And even each atom represents a very complex constitution. Removal of any of its elements transforms it into an ion, other atom or other isotope. A soldier is a simple SFU of the system called "the army". A soldier is a human being's body plus full soldier's outfit. The body of a human being is an extremely complex object, but removal of any of its parts would render the soldier invalid. At that, the soldier's outfit/equipment is multi-component as well. But the equipment cannot shoot without man and the man cannot shoot without the equipment. They can only carry out together the functions inherent in SFU named "soldier". Despite the internal complexity which may be however big, simple SFU is a separate element which looks as a whole unit with certain single property (quality) to fulfill one certain action elementary in relation to the entire system, ie to grasp a ball, molecule, push a portion of blood, produce force/load of 0.03 grams, provide living conditions for the animal (for example, one specific unit of forest area) or to an individual (apartment), fire a shot, etc. Any SFU, once it is divided into parts, ceases to be an SFU for the designated goal. It is due to interaction of the parts only that the group of elements can show its worth as SFU. When something breaks a good owner would always think at first where in his household the fragments may be applied and only thereafter he would throw them out, because one broken thing (one SFU) can be transformed into another, more simple one (another SFU). Haemoglobin is an element of blood circulation system and serves for capturing and subsequent return of oxygen. Hence, haemoglobin molecules are the SFU of erythrocytes. Ligands of haemoglobin molecules are the SFU of haemoglobin, as each of them can serve a trap for oxygen molecules. However, further division of ligand brings to a stop the function of retention of oxygen molecules, etc. The SFU analogues in an inorganic nature/abiocoen are, for example, all material particles possessing ability to lose their properties when dividing - elementary particles (?), atoms, molecules, etc. Viruses may probably be the systemic functional units of heredity (FUH). Thus, it is likely that at first polymeric molecules of DNA type came into being in the claypan strata or even in the interplanetary dust or on comets, based on a type of auto-catalytic Butler's reaction, ie synthesis of various sugars including ribose from formaldehyde in the presence of Ca and Mg ions, ribose being a basis for the creation of RNA and DNA, and thereafter cellular structures emerged. These examples of various concrete SFU show that SFU is not something indivisible, since each of them is multicomponent and therefore can be divided into parts. Only intra-atomic elementary particles may pretend to be true SFU that are the basis of the whole of matter of...
