During intrauterine development and in newborns, there is a red bone marrow in all parts of the bones, which performs a hematopoietic and protective function. In an adult, it is preserved only in the cells of the spongy substance of flat and tubular bones; in the diaphysis of tubular bones, the cavity is filled with yellow bone marrow, which contains fat cells and participates in the metabolism of bone tissue.
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.