A thioglycolate tube was inoculated with an unknown bacterium.After overnight incubation growth is seen only in the area several millimeters below the surface of the agar.This bacterium exhibits a growth pattern characteristic of a(n)

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Microaerophiles require oxygen to survive, but at lower concentrations than are present in the atmosphere. The growth pattern observed, with bacteria growing below the surface where oxygen levels are reduced but not absent, is characteristic of microaerophiles.

A Thioglycolate Tube Was Inoculated with an Unknown Bacterium