( ( ( ( a -RRB- ) ( ( A photoheterotroph ) ( ( ( ( uses light ) ( for energy ) ) and ) ( ( reduced ( ( carbon compounds ) ( for carbon ) ) ) ( ( ( ( b -RRB- ) ( A ( photoautotroph ( uses light ) ) ) ) ( for ( ( energy and ) CO2 ) ) ) ( for carbon ) ) ) ) ) ) ( ( 2 -RRB- ) ( ( All microbes ) ( require ( sources ( of ( ( carbon and ) energy ) ) ) ) ) ) ) . )
(ROOT (S (S (LST (LS a) (-RRB- -RRB-)) (NP (DT A) (NN photoheterotroph)) (VP (VP (VBZ uses) (NP (NN light)) (PP (IN for) (NP (NN energy)))) (CC and) (VP (VBD reduced) (NP (NP (NN carbon) (NNS compounds)) (PP (IN for) (NP (NN carbon)))) (NP (NP (LST (LS b) (-RRB- -RRB-)) (DT A) (JJ photoautotroph) (NNS uses) (NN light)) (PP (IN for) (NP (NN energy) (CC and) (NN CO2))) (PP (IN for) (NP (NN carbon))))))) (S (LST (LS 2) (-RRB- -RRB-)) (NP (DT All) (NNS microbes)) (VP (VBP require) (NP (NP (NNS sources)) (PP (IN of) (NP (NN carbon) (CC and) (NN energy)))))) (. .)))
a) A photoheterotroph uses light for energy and reduced carbon compounds for carbon b) A photoautotroph uses light for energy and CO2 for carbon 2) All microbes require sources of carbon and energy.
(ROOT (S (NP (NNS Photoautotrophs)) (VP (VP (VB capture) (NP (JJ light) (NN energy))) (, ,) (CC and) (VP (VB use) (NP (NN carbon) (NN dioxide)) (PP (IN as) (NP (PRP$ their) (NN carbon) (NN source))))) (. .)))