( ( Invasive species ) ( , ( also ( ( called ( introduced ( ( ( ( ( species , ) ( alien species ) ) , ) or ) ( exotic species ) ) ) ) , ) ) ) )
(ROOT (S (NP (JJ Invasive) (NNS species)) (, ,) (ADVP (RB also)) (VP (VBD called) (VP (VBN introduced) (NP (NP (NNS species)) (, ,) (NP (JJ alien) (NNS species)) (, ,) (CC or) (NP (JJ exotic) (NNS species))))) (, ,)))
Invasive species, also called introduced species, alien species, or exotic species,
(ROOT (S (NP (JJ Exotic) (NNS species)) (VP (VBP are) (ADVP (RB also)) (VP (VBN called) (NP (JJ invasive) (NNS species)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP threaten) (NP (JJ other) (NNS species))))))) (. .)))