Biology, the object of study of which are living beings and their interaction with the environment. Chemistry is the science of substances, their properties, structure and transformations that occur as a result of chemical reactions. Astronomy is a science about the Universe that studies the location, movement, structure, origin and development of celestial bodies and the systems formed by them.
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.