( Facultative ( ( anaerobes ( ( utilize ( oxygen ( and ( aerobic respiration ) ) ) ) ( whenever possible ) ) ) . ) )
(ROOT (S (NP (NNP Facultative)) (VP (VBZ anaerobes) (VP (VB utilize) (NP (NN oxygen) (CC and) (JJ aerobic) (NN respiration)) (SBAR (WHADVP (WRB whenever)) (S (ADJP (JJ possible)))))) (. .)))
Facultative anaerobes utilize oxygen and aerobic respiration whenever possible.
(ROOT (S (NP (JJ Anaerobic) (NN respiration)) (VP (VBZ occurs) (SBAR (IN if) (S (NP (NN oxygen)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN obtained) (PP (IN at) (NP (DT a) (JJ sufficient) (NN rate))))))))) (. .)))