The primary source of energy for the Earth's ecosystem is the Sun. Solar energy drives photosynthesis, a process by which plants convert sunlight into chemical energy, producing oxygen and organic compounds. This energy forms the foundation of food webs, as herbivores consume plants and are then eaten by carnivores. Additionally, the Sun influences climate and weather patterns, impacting ecosystems and their inhabitants. Without this primary energy source, life as we know it—ranging from the smallest microorganisms to the largest mammals—would not be sustainable. Thus, the Sun is vital for maintaining biodiversity and ecological balance.