Seasonal modifications can be attributed to this biological phenomenon. They, in turn, can be attributed to the group of environmental modifications. The latter are adaptive phenotype changes in response to changes in environmental conditions. Ecological modifications phenotypically manifest themselves in a change in the severity of the trait. They can occur in the early stages of development and persist throughout life. An example is the various leaf shapes of an arrowhead, due to the influence of the environment: arrow-shaped surface, wide floating, ribbon-shaped underwater.
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.