( ( ( ( ( During ( ( the course ) ( of evolution ) ) ) ( , ( ( the ( gametophyte stage ) ) ( is ( progressively reduced ) ) ) ) ) ; ) ( thus ( , ( ( in ( ( the higher ) ( ( -LRB- ( i.e. ( , ( vascular -RRB- ) ) ) ) plants ) ) ) ( , ( ( the sporophyte ) ( ( ( is ( ( the ( dominant phase ) ) ( in ( the ( life cycle ) ) ) ) ) , ) ( whereas ( ( in ( the ( ( more primitive ) ( nonvascular plants ) ) ) ) ( ( the gametophyte ) ( remains dominant ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (PP (IN During) (NP (NP (DT the) (NN course)) (PP (IN of) (NP (NN evolution))))) (, ,) (NP (DT the) (JJ gametophyte) (NN stage)) (VP (VBZ is) (ADJP (RB progressively) (JJ reduced)))) (: ;) (S (ADVP (RB thus)) (, ,) (PP (IN in) (NP (ADJP (DT the) (JJR higher)) (PRN (-LRB- -LRB-) (FW i.e.) (, ,) (ADJP (JJ vascular)) (-RRB- -RRB-)) (NNS plants))) (, ,) (NP (DT the) (NN sporophyte)) (VP (VBZ is) (NP (NP (DT the) (JJ dominant) (NN phase)) (PP (IN in) (NP (DT the) (NN life) (NN cycle)))) (, ,) (SBAR (IN whereas) (S (PP (IN in) (NP (DT the) (ADJP (RBR more) (JJ primitive)) (NN nonvascular) (NNS plants))) (NP (DT the) (NN gametophyte)) (VP (VBZ remains) (ADJP (JJ dominant))))))) (. .)))
During the course of evolution, the gametophyte stage is progressively reduced; thus, in the higher (i.e., vascular) plants, the sporophyte is the dominant phase in the life cycle, whereas in the more primitive nonvascular plants the gametophyte remains dominant.
(ROOT (S (NP (NNP Nonvascular) (NNS plants)) (VP (VBP are) (NP (NP (DT the) (JJ only) (NNS plants)) (PP (IN with) (NP (DT a) (NN life) (NN cycle))) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT the) (JJ gametophyte) (NN generation)) (VP (VBZ is) (ADJP (JJ dominant))))))) (. .)))