Question

in ecosystems, organisms at the highest trophic levels usually contain less collective biomass than the organisms at lower trophic levels because

Answer 1

Plants create their own biomass or food by photosyntehsis. However only 10% of this is given to the primary consumer. and 10% of the biomass in the primary consumer is given to the secondary consumer.

This is because most of the biomass is being used in metabolism and excreted out by the organism.