Final answer:
Biofilms involve metabolic cooperation among prokaryotic cells where different species establish metabolic collaborations.
Step-by-step explanation:
Metabolic cooperation among prokaryotic cells is observed in biofilms. Biofilms are communities of microorganisms enmeshed in a matrix of extracellular polymeric substance.
Within a biofilm, different species of microorganisms establish metabolic collaborations, where the waste product of one organism becomes the nutrient for another. This occurs in many polymicrobial infections that involve both aerobic and anaerobic pathogens.