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The ecosystem is a dynamic and interactive system in which living organisms interact with each other and with their physical environment. It is not only the foundation of life on Earth but also a provider of essential services that sustain human survival and well-being. Understanding the major functions of ecosystems is a fundamental part of environmental health because these functions ensure clean air, safe water, fertile soil, balanced climate, and the resources required for all living organisms. When ecosystems are disrupted by human activity or natural changes, the consequences directly affect human health, quality of life, and the sustainability of future generations. One of the most critical functions of ecosystems is the regulation of energy flow and nutrient cycling. Through the process of photosynthesis, plants capture solar energy and convert it into chemical energy, which is passed on to herbivores, carnivores, and decomposers. This energy transfer ensures the survival of all organisms within the food chain. Simultaneously, nutrients such as carbon, nitrogen, phosphorus, and water are cycled through the atmosphere, soil, water bodies, and living organisms. For example, the nitrogen cycle allows plants to absorb nitrogen from the soil in forms they can ___ _______ ______ _________ ________ ______ ________.
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