( ( ( ( ( Vertebrate ( Classification ( There ( are ( ( about 50,000 ) ( vertebrate species ) ) ) ) ) ) , ) and ) ( they ( are ( placed ( in ( nine ( different classes ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Vertebrate)) (VP (VBD Classification) (SBAR (S (NP (EX There)) (VP (VBP are) (NP (QP (RB about) (CD 50,000)) (JJ vertebrate) (NNS species))))))) (, ,) (CC and) (S (NP (PRP they)) (VP (VBP are) (VP (VBN placed) (PP (IN in) (NP (CD nine) (JJ different) (NNS classes)))))) (. .)))
Vertebrate Classification   There are about 50,000 vertebrate species, and they are placed in nine different classes.
(ROOT (S (S (NP (EX There)) (VP (VBP are) (NP (QP (RB about) (CD 50,000)) (JJ vertebrate) (NNS species)))) (, ,) (CC and) (S (NP (PRP they)) (VP (VBP are) (VP (VBN placed) (PP (IN in) (NP (CD nine) (JJ different) (NNS classes)))))) (. .)))