Why can a cell use substances absorbed by it?

Obtained from the outside proteins, fats, carbohydrates, vitamins, trace elements are consumed by cells in the synthesis of the compounds they need, the construction of cellular structures.

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.