( ( Facultative aerobes ) ( ( ( can also ) ( ( exist ( in ( ( the absence ) ( of oxygen ) ) ) ) ( by ( using ( ( ( fermentation or ) anaerobic ) respiration ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Facultative) (NNS aerobes)) (VP (MD can) (ADVP (RB also)) (VP (VB exist) (PP (IN in) (NP (NP (DT the) (NN absence)) (PP (IN of) (NP (NN oxygen))))) (PP (IN by) (S (VP (VBG using) (NP (ADJP (JJ fermentation) (CC or) (JJ anaerobic)) (NN respiration))))))) (. .)))
Facultative aerobes can also exist in the absence of oxygen by using fermentation or anaerobic respiration.
(ROOT (S (NP (NNP Fermentation)) (VP (VBZ does) (RB not) (VP (VB use) (NP (NN oxygen)))) (. .)))