All animals depend on plants. Some animals eat plants for food. Other animals eat animals that eat the plants. 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. Resources include those things that we get from the living and nonliving environment to meet the needs and wants of a population. The supply of many resources is limited. If used, those materials can be extended through recycling and decreased use. Environments include the space, conditions, and factors that affect individual's and population's ability to survive and quality of life.