Behavior – the totality of all actions of the body. Behavioral reactions are caused not only by external, but also by internal influence. When a predator and a victim meet, the victim is frightened and often forced to flee. With a prolonged absence of food in the blood of a predator, the amount of nutrients (glucose, amino acids) decreases. This deficiency is perceived by chemoreceptors and then through nerve impulses enters the center of the hunger of the brain. Thus, a predator forms a feeling of hunger, which pushes him to search for prey (this process is in the nature of an algorithm).
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.