The ability of organisms to acquire new traits in the process of life?

Each organism is capable of receiving new adaptations, mutations and changes in the process of life. These features can be passed on to offspring. The evolution of living organisms takes place on the basis of variability and heredity. But variability does not include the processes that are characteristic of all representatives of the species in the process of growth and development. For example, the loss of milk teeth and the growth of permanent teeth in a person does not belong to variability, as well as changes in facial features, hair color and other changes.