( It ( ( is ( threatened ( by ( invasive ( ( species and ) over-fishing ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (VP (VBN threatened) (PP (IN by) (NP (JJ invasive) (NNS species) (CC and) (NN over-fishing))))) (. .)))
It is threatened by invasive species and over-fishing.
(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))))))) (. .)))