Answer: Definition of an Ecosystem
Explanation: An ecosystem is a complex network of interconnected living organisms and their physical environment, where energy is exchanged and nutrients are cycled. It includes all the biotic (living) and abiotic (non-living) components in a particular area, such as plants, animals, soil, water, air, and sunlight. Ecosystems can vary in size and complexity, ranging from a small pond to a vast rainforest, but they all function in a dynamic balance that sustains life.