* Location: The biomass of a certain group can be vastly different depending on where you're looking. For example, phytoplankton in the ocean have a much greater biomass than the same group in a small pond.
* Time: Biomass can change over time due to seasonal variations, environmental conditions, and other factors.
* Definition of "group": Are we talking about a specific species, a taxonomic group (e.g., insects), or a broader ecological category (e.g., decomposers)?
However, some generally less biomassive groups might include:
* Deep-sea organisms: The extreme conditions in the deep sea limit the amount of life that can exist there.
* Some rare or endangered species: Due to their low numbers, these species naturally have less biomass.
* Microorganisms: While microorganisms are incredibly abundant, their individual size means they contribute relatively little to overall biomass compared to larger organisms.
To give a more accurate answer, you'd need to specify the location, time frame, and definition of "group" you're interested in.
