( ( Most ( of ( ( Earth 's ) oxygen ) ) ) ( ( comes ( from ( ( ( tiny ( ocean plants ) ) ( -- ( ( called phytoplankton ) -- ) ) ) ( that ( ( live ( near ( ( the ( water 's ) ) ( ( surface and ) drift ) ) ) ) ( with ( the currents ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (NNP Earth) (POS 's)) (NN oxygen)))) (VP (VBZ comes) (PP (IN from) (NP (NP (JJ tiny) (NN ocean) (NNS plants)) (PRN (: --) (VP (VBN called) (NP (NN phytoplankton))) (: --)) (SBAR (WHNP (WDT that)) (S (VP (VBP live) (PP (IN near) (NP (NP (DT the) (NN water) (POS 's)) (NN surface) (CC and) (NN drift))) (PP (IN with) (NP (DT the) (NNS currents))))))))) (. .)))
Most of Earth’s oxygen comes from tiny ocean plants – called phytoplankton – that live near the water’s surface and drift with the currents.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (NN earth) (POS 's)) (NN water)))) (VP (VBZ is) (VP (VBN located) (PP (IN in) (NP (NNS oceans)))))))