A pyramid of numbers is defined as a pyramid that shows the number of organisms in each trophic level. Therefore, the correct description is b. the number of organisms in each trophic level is counted and presented.
A pyramid of biomass is ddefined as a pyramid that shows the biomass in each trophic level. Biomass is the total amount of organic material in a specific environment. Therefore, the correct description is c. the amount of living material of organisms is measured and presented.
A pyramid of energy is defined as a pyramid that shows the amount of energy that stays in the organisms of each trophic level. Therefore, the correct description is a. the amount of energy retained at each trophic levels is measured and presented.