Saved Review the many ways in which microbes process oxygen by completing each sentence. Microaerophiles aerobe With respect to oxygen requirements, an can use gaseous oxygen and possesses enzymes to process toxic oxygen products. facultative anaerobes aerobe cannot grow Expanding on this classification, an without oxygen. Anaerobes obligate Still other organisms, called .. prefer oxygen but can grow in its absence. are aerobes, but they can only tolerate very minute concentrations of oxygen in their environment. represent a group of organisms whose members lack the required enzymes needed for using oxygen in respiration and may not be able to tolerate any free oxygen in their environment Reset