The correct answer is: C. Pyramid of number.
A pyramid of number is a graphical representation of the number of individuals of different species belonging to each trophic level in an ecosystem. It is a type of ecological pyramid, which is a graphical representation of the relative abundance of organisms at different trophic levels in an ecosystem.
The base of the pyramid represents the primary producers, which are the organisms that are able to capture energy from sunlight and use it to produce their own food. The next level up represents the primary consumers, which are the organisms that eat the primary producers. The next level up represents the secondary consumers, which are the organisms that eat the primary consumers. And so on.
The shape of the pyramid of number is always inverted, with the number of organisms decreasing at each higher trophic level. This is because there is less energy available at each higher trophic level. The energy that is not used by the organisms at one trophic level is lost as heat.
Pyramids of biomass and pyramids of energy are also types of ecological pyramids. A pyramid of biomass is a graphical representation of the total mass of living organisms at different trophic levels in an ecosystem. A pyramid of energy is a graphical representation of the total amount of energy at different trophic levels in an ecosystem.
The shape of a pyramid of biomass is always upright, with the total mass of organisms increasing at each higher trophic level. This is because the organisms at higher trophic levels are larger than the organisms at lower trophic levels.
The shape of a pyramid of energy is always inverted, with the total amount of energy decreasing at each higher trophic level. This is because there is less energy available at each higher trophic level. The energy that is not used by the organisms at one trophic level is lost as heat.