* Photosynthesis: Plants and other photosynthetic organisms use sunlight to convert carbon dioxide and water into sugars (glucose), which provides them with energy. This process is the foundation of most ecosystems.
* Food Webs: Plants are eaten by herbivores, which are then eaten by carnivores. This transfer of energy through different levels of consumers creates the food web. The energy that fuels this entire web ultimately comes from the sun.
* Decomposers: Even after organisms die, their energy isn't lost. Decomposers (like bacteria and fungi) break down dead organisms and waste, returning nutrients to the soil, which plants can then utilize to start the energy cycle again.
In summary, the sun is the ultimate source of energy for most ecosystems, powering the processes that sustain all life within them.
