( Yes ( , ( they ( ( eat ( only plants ) ) . ) ) ) )
(ROOT (S (INTJ (UH Yes)) (, ,) (NP (PRP they)) (VP (VBP eat) (NP (JJ only) (NNS plants))) (. .)))
Yes, they eat only plants.
(ROOT (S (NP (DT The) (NN heterotroph)) (VP (VBZ eats) (NP (UCP (ADJP (JJ only)) (CC or) (ADVP (RB mainly))) (NNS plants))) (. .)))