( ( For ( aerobic fermentations ) ) ( , ( air ( ( ( is typically ) ( used ( because ( it ( is ( inexpensive ( to ( ( provides ( enough oxygen ) ) ( for ( cellular respiration ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (JJ aerobic) (NNS fermentations))) (, ,) (NP (NN air)) (VP (VBZ is) (ADVP (RB typically)) (VP (VBN used) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ is) (ADJP (JJ inexpensive) (S (VP (TO to) (VP (VBZ provides) (NP (JJ enough) (NN oxygen)) (PP (IN for) (NP (JJ cellular) (NN respiration)))))))))))) (. .)))
For aerobic fermentations, air is typically used because it is inexpensive to provides enough oxygen for cellular respiration.
(ROOT (S (NP (NNP Fermentation)) (VP (VBZ does) (RB not) (VP (VB use) (NP (NN oxygen)))) (. .)))