An interaction that contributes to the stability of this ecosystem is: B. Species B returns compounds to the environment that may later be used by species C.
An ecosystem simply refers to a biological community that is made up of species of living organisms (biotic factors) and the physical environment (abiotic factors) in which they exist and all interact.
Based on the schematic diagram shown in the image attached below, we can logically deduce that an interaction which contributes to the stability of this ecosystem is that Species B returns chemical compounds to the environment that may later be used by species C.
Read more on an ecosystem here: brainly.com/question/15971107
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