Why is a cell considered the basic structural and functional unit of living?

Because all living organisms are composed of cells, and the cell is the smallest unit of the body that has the signs of a living: metabolism, growth, reproduction and irritability. A cell is an elementary unit of the living, possessing all its attributes. Every organism is made up of cells.

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.