Biomass

Biomass is defined as the amount of organic matter in a given habitat (usually expressed as weight).  As trophic levels increase, the amount of biomass decreases because the amount of organisms per tropic level decreases as the trophic level increases. However, if the organisms are large (like a large tree), then it is possible for there to be more biomass with fewer numbers at the bottom of the graph:

https://communityecology.files.wordpress.com/2010/12/biomass.jpg?w=300

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