This document provides information about the organization of living things. It begins with definitions of key terms like biodiversity and describes the basic life processes of interaction, nutrition, and reproduction that all living things carry out. It then discusses the organization of cells in both animals and plants, including the parts of animal and plant cells. The document outlines the differences between unicellular and multicellular organisms and how animals and humans are organized. Finally, it provides information about the major human body systems, including the respiratory, excretory, circulatory, digestive and nervous systems and their functions related to nutrition and interaction.