Typically, a small amount of biomass. The ecosystem of the intermountain high plateau is very nearly desert, and thus is unable to support large biomass quantities typical of prairie or forested ecosystems.
The biomass is the amount of living matter in an environment. It is neither good nor bad. Humans are part of the biomass of their environment. The environment can only support a certain amount of biomass before the resources are depleted.
A food chain in the order in which living organisms consume each other in a particlar ecosystem. Whereas a biomass pyramid shows the progression of energy through a food chain and the amount each trophic level is required to consume.