An individual, or an individual (from the Latin. Individuum – indivisible), is an indivisible unit of life. The most important sign of any living organism is the strict interdependence of its individual parts. Dividing an individual into parts will lead to the loss of its integral unique personality. A person, a bird, a tree are individuals, but the liver, brain, wing, beak, leaf or branch do not possess the signs of a whole organism. An organism is not a simple sum of cells, tissues, and organs. Only strict subordination and interaction form a new unity and give individuals the features and properties that are absent in its individual components.
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.