The human body is a single whole. A person with its complex anatomical structure, physiological and mental characteristics represents the highest stage of the evolution of the organic world. A characteristic organization of every organism is a certain organization of its structures.
An organism is a biological system consisting of interconnected and subordinate elements, the relationships of which and the features of their structure are subordinate to their functioning as a whole. The human body consists of organ systems that interact with each other. Each body carries out its function. Therefore, the vital functioning of the whole organism largely depends on the proper functioning of all organs. However, many complex processes, such as respiration, excretion, etc., cannot be performed by one organ. They are carried out by a system of organs.
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.