The arrow leading to detritus represents the magnitude and should show the largest biomass exiting primary producers.
In a natural ecosystem, organic material is home to the food chain. They exist and expand if there are resources to support them, given that they are immobile.
Detritus is the organic material that has been lying around, and this organism is considered the left out part of the living organism.
The greatest biomass leaving primary producers should be shown by the line going to detritus, which signifies intensity.
Learn more about primary producers, here:
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