Answer: Biomass pyramid
Step-by-step explanation:
A pyramid of biomass can be used as a graphical representation that is used for the biomass present per unit area of various tropic level.
It shows the relationship between the animals at each tropic level and biomass. It helps in quantifying the biomass that is available for each tropic level.
Hence, the correct answer is Pyramid of biomass is used by the scientist to calculate the amount of food available at each tropic level.