1) A cell is a universal structural, functional and genetic unit of a living thing.
2) All cells have a similar structure, chemical composition and general principles of life.
3) New cells are formed only as a result of division of the original cells.
4) Cells are capable of independent life, but in multicellular organisms, their work is coordinated and the organism is an integral system.
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.