Why is a population called a structural unit of evolution?

A population is considered a unit of evolution and a structural unit of a species; it is the smallest group of individuals that can evolve. It is characterized by the number of representatives, variability, the generality of the territories it occupies, as well as the sex and age composition. A change in the size of populations, a sharp decrease in it can lead to the death of the population.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.