( Thus ( , ( ( these plants ) ( ( are ( ( heterotrophs and ) ( usually parasitic ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Thus)) (, ,) (NP (DT these) (NNS plants)) (VP (VBP are) (ADJP (ADJP (JJ heterotrophs)) (CC and) (ADJP (RB usually) (JJ parasitic)))) (. .)))
Thus, these plants are heterotrophs and usually parasitic.
(ROOT (S (NP (DT The) (NN heterotroph)) (VP (VBZ eats) (NP (UCP (ADJP (JJ only)) (CC or) (ADVP (RB mainly))) (NNS plants))) (. .)))