Final answer:
The largest level of classification is the Phylum in the hierarchical system of biological classification.
Step-by-step explanation:
In the hierarchical system of biological classification, the largest level is the Phylum. It is above the levels of Order, Family, and Class. Phylum groups together organisms that share a common body plan or structural characteristics. For example, animals in the Phylum Chordata have a notochord or spinal cord.
Learn more about Biological classification