Biology STAAR Practice Test 2026 - Free State of Texas Assessments of Academic Readiness Practice Questions and Study Guide

The term that relates to the classification of organisms into ranks is taxon. In biological classification, a taxon refers to a group of one or more populations of organisms which are considered a unit. This can include categories such as species, genus, family, order, class, phylum, and domain. Each of these categories represents different ranks within the hierarchical system of biological classification.

Understanding this concept is essential for taxonomy, which is the science of naming and classifying organisms. The other terms provided do not specifically relate to classification ranks. Species refers to a specific group of organisms that can interbreed, clade refers to a group of organisms that includes an ancestor and all its descendants, and tissue is a group of similar cells that perform a specific function in an organism, none of which pertain to the broader classification system.