The concept of structural levels allows not only to describe living organisms according to their complexity and functioning patterns, but also to arrange them in a hierarchical order, in which each previous level is included in the next one, forming a single whole living system. Thus, the representation of the levels of organization is well combined with the integrity of the body. The criterion for the selection of basic levels are specific discrete structures and fundamental biological interactions.
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.