Some animals eat plants for food. Other animals eat animals that eat the plants. Animals differ in many ways. Each plant or animal has different structures which serve different functions in growth, survival, and reproduction. For example, humans have distinct structures of the body for walking, holding, seeing, and talking.
Different substances can damage the body and how it functions.
Students should understand that some substances such as prescription drugs can be beneficial but that any substance can be harmful. The human body is composed of sensory organs which detect heat, light, and sound. All animals depend on plants. Some animals eat plants for food. Other animals eat animals that eat the plants.