Correct option (d) all of these.
Explanation :
The relationship in an ecosystem can be depicted in pyramid of energy, pyramid of biomass, pyramid of numbers etc. Pyramid of number depicts the number of individual organisms at different trophic levels of food chain. The biomass of the members of the food chain present at any one time forms the pyramid of biomass. When production is considered in terms of energy, the pyramid indicates the amount of energy flow at each level. This is called pyramid of energy.
