Why are producers at the base of an energy pyramid?

Producers are at the base of an energy pyramid because they are the primary source of energy in an ecosystem, converting sunlight into usable energy through photosynthesis. This process allows them to produce organic matter, which serves as food for consumers at higher trophic levels. As the energy pyramid ascends, energy decreases due to energy loss at each trophic level, making producers essential for sustaining the energy flow in ecosystems.