What is the behavior? Describe the behavior of animals caused by external and internal influences.

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).