What system is used for the binomial nomenclature of organisms?

The binomial nomenclature system, developed by Carl Linnaeus, uses a two-part naming convention to identify species. This system consists of the genus name followed by the species name. The purpose of this system is to provide a universal way to name organisms, avoiding confusion that may arise from common names that vary by language and region.

In this context, the genus represents a group of closely related species. For example, in the name Homo sapiens, Homo is the genus, and sapiens is the species. This two-part format is essential for accurately identifying and communicating about the vast diversity of life on Earth.

The other options represent hierarchical classifications within biological taxonomy but do not pertain specifically to the naming of an individual organism. Kingdom and species, order and class, and phylum and family refer to broader taxonomic categories rather than the specific identification paired in the binomial nomenclature system. This distinction makes the correct answer clearly focused on the method used specifically for naming organisms at the species level.