What is the organization of an ecosystem from the smallest to largest?

if you mean the feeding levels they are Producers: photosynthetic organisms, such as plant first order consumers: herbivores and animals that eat directly from the producers Second level consumers: these eat the first order consumers but can also eat the producers. this goes on to ussually no more than 5 levels as the energy transphere drops at each level and any more than a fith order consumer would not be able to consume enough tissue to survive.