Yersinia enterocolitica is a parasitic bacteria that uses a host organism, the two most common being Humans and a reservoir in pigs. Y. enterocolitica being heterotrophic derives its energy by breaking down organic compounds found in its host.  These bacteria are facultatively anaerobic meaning they can perform aerobic respiration when oxygen is present but have to ability to switch to fermentation in a system when oxygen is lacking. When undergoing fermentation of D-glucose they produce acid. Unfortunately though, Yersinia enterocolitica does not have a simple food pyramid to follow.

USDA food pyramid 

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