Respuesta :
The definition of biomass is the mass of all living material. Pretty sure it is D.
Answe:D
Mass of organic matter
A biomass pyramid differs by showing the mass of organic matter at each tropic level.
A biomass pyramid is a graphical representation which shows the biomass( biological productivity by organisms) at each tropic level. It shows how mach biomass it has at each tropic level for each ecosystem. So if we are considering how two biological pyramid differs, the answer would be they would be differ in mass of organic matter for every level in both the ecosystem separately.