Here's why:
* Photosynthesis: Plants and other photosynthetic organisms use sunlight to convert carbon dioxide and water into glucose (sugar) and oxygen. This process, called photosynthesis, is the foundation of most food chains.
* Food Chains: Animals eat plants or other animals that have consumed plants, ultimately deriving their energy from the sun.
* Decomposers: Even organisms like bacteria and fungi, which break down dead matter, rely on the energy originally captured by plants through photosynthesis.
While there are some organisms that can utilize energy sources like geothermal vents, the vast majority of life on Earth relies on the sun's energy, making it the primary source.
