The main qualitative difference of a person is, of course, conscious labor, which is the border dividing a person and his distant ancestors. Also, a person is distinguished by some structural features of the body associated with upright posture, labor, development of speech. In connection with upright posture, the position of the body changed and an S-shaped spine was formed. Other progressive elements associated with walking on two legs are: vaulted, springy foot, extended pelvis, shorter and wider chest. In connection with labor activity, a person’s hand is small, thin and mobile, which makes it possible to perform various movements.
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.