1) The cell is a system, because it consists of many interconnected and interacting parts – organelles and other structures.
2) The system is open, because it receives substances and energy from the environment, and metabolism is carried out in it.
3) A relatively constant composition is maintained in the cell due to self-regulation carried out at the genetic level. The cell is able to respond to stimuli.
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.