In modern taxonomy, when assigning any organism to one rank or another, a number of signs are distinguished. First of all, these are features of origin and historical development, morphological and anatomical structure, reproduction, embryonic development. In addition, physiological and biochemical features, the type of reserve nutrients, the nature of the habitat, the structure and chemical composition of cells, the number and composition of chromosomes, etc. are taken into account.
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.