Final answer:
The largest level of classification in the taxonomic system is the domain, which includes three major categories: Bacteria, Archaea, and Eukarya.
Step-by-step explanation:
The largest level of classification in the taxonomic system is the domain. The taxonomic system, also known as the Linnaean system, uses a hierarchical model to classify living organisms. At the highest and most inclusive level, all life is divided into three large categories called domains, namely Bacteria, Archaea, and Eukarya. Each domain encompasses subcategories, that further narrow down into kingdoms, phyla, classes, orders, families, genera, and ultimately, the most specific category, the species. The system is designed to reflect the evolutionary relationships between organisms, with species within the same group being more closely related to each other than to those in different groups.