Variability is a universal property of the living, expressed in the body’s ability to exist in various forms (variants). Non-hereditary variation is not related to genetic material; changes in traits affect only the phenotype and are not transmitted to future generations. Variability of this kind reflects changes in the phenotype under the influence of various environmental factors. Examples of non-hereditary variability include a person’s tan, weight gain, high yield on fertile soil, etc.
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.