Final answer:
In an ecological pyramid, the widest bar is almost always the producer, which is a species that creates energy.
Step-by-step explanation:
In an ecological pyramid, the widest bar is almost always the producer, which is a species that creates energy. Ecological pyramids represent the flow of energy and biomass through different trophic levels in an ecosystem. Producers, such as photosynthetic organisms, have the largest biomass and provide energy for the rest of the food chain.