This document discusses variation and classification. It explains that living things can be organized into categories by grouping organisms with similar features, which is called the classification system. Variation refers to the differences seen in characteristics of living things. Inherited traits are features passed down from parents, such as eye, skin, and hair color. The document provides examples of classifying oneself by listing gender, age, physical attributes, and inherited traits. It includes a sample classification file of the author Dilshan that organizes these identifying details.