What model shows the number of organisms at each tropic level in an ecosystem?

The major types of ecological pyramids are a pyramid of numbers or biomass or energy.

The pyramid of numbers depicts the number of individual organisms at different trophic levels of food chain. Successive links of trophic structure decrease rapidly in number until there are very few carnivores at the top.

In many ecological pyramids, the producers form the base and the successive trophic levels make up the apex. The apex is a term meaning pointed top.

Energy pyramids are always slopping because less energy is transferred from each level than was paid into it.