( Algae ( ( ( ( have ( photosynthetic machinery ) ) ultimately ) ( derived ( from ( cyanobacteria ( that ( ( ( ( produce oxygen ) ( as ( ( a by-product ) ( of photosynthesis ) ) ) ) , ) ( unlike ( ( other ( photosynthetic bacteria ) ) ( such ( as ( purple ( and ( green ( sulfur bacteria ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Algae)) (VP (VBP have) (NP (JJ photosynthetic) (NN machinery)) (ADVP (RB ultimately)) (VP (VBN derived) (PP (IN from) (NP (NP (NN cyanobacteria)) (SBAR (WHNP (WDT that)) (S (VP (VBP produce) (NP (NN oxygen)) (PP (IN as) (NP (NP (DT a) (NN by-product)) (PP (IN of) (NP (NN photosynthesis))))) (, ,) (PP (IN unlike) (NP (NP (JJ other) (JJ photosynthetic) (NNS bacteria)) (PP (JJ such) (IN as) (NP (JJ purple) (CC and) (JJ green) (NN sulfur) (NNS bacteria)))))))))))) (. .)))
Algae have photosynthetic machinery ultimately derived from cyanobacteria that produce oxygen as a by-product of photosynthesis, unlike other photosynthetic bacteria such as purple and green sulfur bacteria.
(ROOT (S (PP (IN On) (NP (DT a) (JJ global) (NN scale))) (, ,) (NP (NP (NNS plants)) (CC and) (NP (JJ other) (JJ photosynthetic) (NNS organisms))) (VP (VBP have) (VP (VBN generated) (NP (NP (DT all)) (PP (IN of) (NP (NP (DT the) (NN oxygen)) (PP (IN in) (NP (DT the) (NN air)))))))) (. .)))
On a global scale, plants and other photosynthetic organisms have generated all of the oxygen in the air.