1) during photosynthesis, the concentration of oxygen and carbon dioxide is regulated: oxygen is released and carbon dioxide is absorbed;
2) during breathing and fermentation, the concentration of oxygen and carbon dioxide is regulated: oxygen is absorbed and carbon dioxide is released;
3) as a result of nitrogen fixation, bacteria absorb molecular nitrogen from the atmosphere, during denitrification, nitrogen is released
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.