Producer organisms are at the base of all ecological pyramids. They are the only organisms which can make their own food (autotrophs). The overwhelming majority of them are green plants and single celled organisms which photosynthesise, though a few are chemautotrophs, that is they get energy from inorganic materials.
Something can't come from nothing. Energy cannot be created or destroyed. It can only be converted and transferred. Producers are the only living organisms of earth that are able to convert sunlight to energy. If it was not at the bottom of the energy pyramid, the organisms below it would not exist because they were not getting energy from the producers.
Producers must be at the base of every food chain because they get their energy from the sun, and then they give their energy to the consumers. The reason why it is like this because the producers just produce energy but don't eat other organisms to get their energy. That is why the producers must be at the bottom of every food chain. I hope this helps. .__.
The energy pyramid has a broad base to support the next level of organisms, then gets narrower as each layer is added. Each upper level eats more than one ie many organism from the layer below it. Therefore, there has to be more organisms and more energy trapped in lower layers to give energy to the upper layer. There is more grass than rabbits, there are more rabbits than hawks. There is more energy in…