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Ecological systems refer to interconnected networks of living organisms and their physical environment, functioning together as a complex and dynamic unit. These systems involve interactions between biotic (living) and abiotic (non-living) components, such as plants, animals, soil, water, air, and climate. They can range in scale from small habitats, like a pond or forest, to larger ecosystems, like a desert or rainforest. Ecological systems play a crucial role in sustaining life on Earth by regulating nutrient cycles, supporting biodiversity, and providing essential services such as clean air and water. They are constantly evolving and adapting to changes in their environment, making them highly resilient and diverse.