Why oxygen, hydrogen, nitrogen, carbon, calcium and a number of other chemical elements were in the group of macronutrients of living organisms on our planet.

Because these chemical elements and their compounds are required by organisms in relatively large quantities. They enter the metabolic processes of cells and are vital chemical components of living organisms.


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.