Answer:
differences in temperament
Step-by-step explanation:
The children mentioned in the question above have differences in temperament.
When we speak of temperament, we refer to that innate part of our personality that is determined by our genetic heritage. Therefore, the biological and instinctive dimension of the personality is considered. In fact, temperament is the first personality factor to manifest.
Because it is of genetic origin and the result of a hereditary constitution, temperament can hardly be modified, manipulated or changed by circumstances. In some way, this tendency will always exist; although it is no less true that we can use resources to increase or inhibit its manifestation. If we were an iceberg, the temperament would always be part of the submerged portion, being able to exercise some control to modify the way it manifests itself in the uncovered portion.