This document outlines learning standards and lesson plans related to teaching biological classification from kindergarten through high school biology. In kindergarten, students learn to sort living and non-living things and group animals based on physical attributes. Later grades introduce classifying organisms by habitat, using dichotomous keys, learning the five kingdoms, and deriving the relationship between single-celled and multi-cellular organisms. The standards show an increasing complexity in classification skills over the years that builds students' understanding of this important biological concept.