What determines a person’s need for oxygen?

From age (a growing body needs more energy and more oxygen), from the state of sleep and wakefulness (in a dream, the need for oxygen is reduced), from the level of physical activity.

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.