The number of mitochondria in the cells of various living things and tissues is not the same. For example, in spermatozoa, some algae and protozoa may have only one metochondria. But in tissue cells, where energy costs are high, there are up to several thousand (in animals – liver cells, muscle cells). The number of mitochondria in a cell depends on its age: in young cells there are much more of them than in aging cells.
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.