After the nutrients enter the cell, some of them are spent on supporting vital processes. The rest are used to obtain energy in the process of breathing.
Aerobic respiration is carried out with the obligatory participation of oxygen. This gas is required for the oxidation of organic matter. As a result of the reaction, the energy necessary to maintain the normal functioning of the body appears, as well as carbon dioxide and water.
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.