( Photosynthesis ( ( ( ( ( adds oxygen ) ( to ( the atmosphere ) ) ) and ) ( removes ( carbon dioxide ) ) ) ; ) )
(ROOT (S (NP (NNS Photosynthesis)) (VP (VP (VBZ adds) (NP (NN oxygen)) (PP (TO to) (NP (DT the) (NN atmosphere)))) (CC and) (VP (VBZ removes) (NP (NN carbon) (NN dioxide)))) (: ;)))
Photosynthesis adds oxygen to the atmosphere and removes carbon dioxide;
(ROOT (S (NP (NP (DT The) (NN process)) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NP (NN oxygen)) (PP (IN in) (NP (PRP$ our) (NN atmosphere))))))))) (VP (VBZ is) (NP (NN photosynthesis))) (. .)))