Which term refers to the classification system used to organize living organisms?

The term that refers to the classification system used to organize living organisms is taxonomic hierarchy. This system is fundamental in biology as it provides a structured framework for categorizing organisms based on shared characteristics and evolutionary relationships. The taxonomic hierarchy includes several levels, such as domain, kingdom, phylum, class, order, family, genus, and species. Each level represents a rank in the organization of living organisms, helping scientists communicate about biodiversity and understand the relationships among different species.

Taxonomic categorization is essential for studying ecology, evolution, and conservation, as it allows researchers to classify living things systematically and facilitates the identification of species. This structure aids in the understanding of how various organisms relate to one another, based on their common ancestry. While the other options refer to different aspects of biology, such as genetics and ecological relationships, they do not specifically denote the formal system used for classifying all living organisms.