( ( ( ( Most ( have ( ( ( reproductive systems ) , ) ( ( producing gametes ) ( for ( sexual reproduction ) ) ) ) ) ) ; ) ( ( ( ( ( ( the ( vast majority ) ) ( of ( flatworm individuals ) ) ) ( ( are simultaneously ) ( ( ( male and ) female ) ( -LRB- ( monoecious -RRB- ) ) ) ) ) , ) and ) ( many ( are ( built ( so ( that ( they ( ( can sexually ) ( ( reproduce all ) ( by themselves ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (JJS Most)) (VP (VBP have) (NP (NP (JJ reproductive) (NNS systems)) (, ,) (NP (NP (VBG producing) (NNS gametes)) (PP (IN for) (NP (JJ sexual) (NN reproduction))))))) (: ;) (S (S (NP (NP (DT the) (JJ vast) (NN majority)) (PP (IN of) (NP (NN flatworm) (NNS individuals)))) (VP (VBP are) (ADVP (RB simultaneously)) (ADJP (ADJP (JJ male) (CC and) (JJ female)) (PRN (-LRB- -LRB-) (NP (NNS monoecious)) (-RRB- -RRB-))))) (, ,) (CC and) (S (NP (DT many)) (VP (VBP are) (VP (VBN built) (SBAR (RB so) (IN that) (S (NP (PRP they)) (VP (MD can) (ADVP (RB sexually)) (VP (VB reproduce) (NP (DT all)) (PP (IN by) (NP (PRP themselves))))))))))) (. .)))
Most have reproductive             systems , producing gametes for sexual reproduction;  the             vast majority of flatworm individuals are simultaneously male and female ( monoecious ),             and many are built so that they can sexually reproduce all             by themselves.
(ROOT (S (NP (NP (DT The) (JJ vast) (NN majority)) (PP (IN of) (NP (NN fish)))) (VP (VB reproduce) (ADVP (RB sexually))) (. .)))