Why are the levels of organization of life distinguished in biology?

In biology, some levels of organization of life are distinguished. For example – kind, type, class, realm, or domain. This is essential for the study of living things. This allows you to divide all living things into large groups, divide these groups into smaller ones, and so on. Each such group is studied by a certain science, since one science cannot study all living organisms. For example: plants are studied by botany, but the whole kingdom cannot be studied, therefore there are more highly specialized sciences that study certain species.