Why is food, respiration and excretion necessary for every living being?

For every living being, the processes of nutrition, respiration and excretion are necessary because without them there is no metabolism in the body: energy is needed for the life of living beings; it is obtained from food that is processed in the body with the participation of oxygen; unnecessary substances – harm the body, are removed from it.

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.