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<p>They can catabolize organic compounds by respiration, fermentation, or both. <a href="page.php?w=Fermentation">Fermenting</a> heterotrophs are either facultative or obligate <a href="page.php?w=Anaerobic_organism">anaerobes</a> that carry out fermentation in low oxygen environments, in which the production of ATP is commonly coupled with <a href="page.php?w=substrate-level_phosphorylation">substrate-level phosphorylation</a> and the production of end products (e.g. alcohol, , sulfide). These products can then serve as the substrates for other</p><p>
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