Natural systems refer to the complex networks of living organisms and their physical environment that interact and function together. These systems include ecosystems, which consist of plants, animals, and microorganisms, as well as the air, water, and soil that support them. Each component plays a vital role in maintaining balance and supporting life. Examples of natural systems include forests, oceans, and wetlands. In these systems, energy flows through food chains, and nutrients cycle through various processes. Understanding natural systems is essential for conservation efforts and sustainable management of resources, as they provide essential services like clean air, water, and biodiversity.