What should an ecologist measure in order to construct a pyramid of biomass for an ecosystem? a. the biomass in each trophic level of the food web b. the total mass of all the organisms in a representative area of the ecosystem c. the total mass of all the organisms in the ecosystem d. the number of organisms in each trophic level of the food web

Option B is correct. An ecologist measure the total mass of all the organisms in a representative area of the ecosystem in order to construct a pyramid of biomass for an ecosystem.

Pyramid of Biomass:

The diagrammatic representation of amount of organic material.It is measured in gram of dry mass per square meter ().IT is decrease as we went higher to trophic level.It oceanic ecosystem, the pyramid of biomass is inverted.

Hence, Option A, C, and D can be eliminated.

Therefore, we can say that an ecologist measure the total mass of all the organisms in a representative area of the ecosystem in order to construct a pyramid of biomass for an ecosystem.

For more about ecosystem, you can refer to the link:

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When constructing a pyramid of biomass, the ecologist will produce a presentation of the total mass off all the organisms in a representative area of the ecosystem. This type of ecological pyramid is determined by collecting organisms in each trophic level separately and finding their dry weight. Determining biomass in terms of dry weight is more accurate. The pyramid has a larger shape at the bottom and a diminishing shape as it goes to the top.

It would be your third option