to single out two more sub-worlds/natures: flora and fauna. The criterion for such division is the complexity of the control block and its ability (The availability of possibility) to show behavioral reactions. The more complex the control block, the higher is the development of animal as a system. But at that, note should be taken of the fact that the development of systems from plants to animals was basically solving only one problem - to be/exist in this World. The purport of existence of plants and the majority (if not of all) of animals, except for humans, is only in the metabolism. If the system is hungry it operates, if is satiated it stays idle. Yes, with complication of the control block simultaneous increase in the possibilities of systems occurred too, but it still pursued the goals of metabolism. More adapted animal feeds better. If the system plays and lives jolly (emotional tint of behavioral reactions), such reactions as a rule are still directed towards self-training of systems for better hunting for other systems. Therefore such reactions are basically inherent in young animals. More adult individuals do not play any more. Note should be also taken of that division of animals into predators and herbivorous animals is quite conditional, since it is not eating meat that is a distinctive feature of a predator and plants may also be carnivorous (for example, sundew and the like). Absolutely all animals, and not only them, but plants as well, are predators, since they represent the systems which feed on other systems. Even among the objects of mineral nature mutual relations of a victim-predator type may be found. Some systems (plants and herbivores) feed on systems with simple control blocks (mineral objects and plants) because it is easier thing to do. However, other systems (carnivorous) feed or try to feed on systems with complex control blocks (other animals), although it is much more complex to do so. That is why the donkey is more stupid than a tiger. The human being differs from other objects of animate nature first of all in that it is not metabolism which is the main purport of his/her life, but cognition. Yes, the higher the level of knowledge, the better the nutrition. But the process of cognition in itself prevails over all other processes aimed at metabolism. And even the metabolism itself is raised to the rank of art (the cookery). It is also possible to single out the human nature in that way as well, since only a human being out of all objects of our World has second signaling system (the intellectual control block) and aspiration towards cognition. Hence, the purpose of our World was evolution which has stipulated the development of systems in the direction towards complexification of their control blocks up to a human being. And the purpose of this evolution was to develop systems to such a degree that they have learnt to cognize the World. We can look back and see the confirmation of it throu...