The organism that can thrive in both the presence and absence of oxygen in the air and the consumption of sugar increases as oxygen is removed from the organism's environment will be: facultative anaerobe.
Facultative anaerobes are the organisms that can perform cellular respiration in the presence of oxygen but can switch to fermentation instantly when oxygen is removed from their surroundings. The example of such organisms are: Escherichia coli, Salmonella, Listeria spp., etc.
Fermentation is the process of breakdown of sugar to yield products like lactose or alcohol, in the absence of oxygen. The breakdown of sugar is performed to yield energy for the body processes.
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