( ( Learn ( how ( to ( ( tell ( the ( invasive exotics ) ) ) ( from ( other species ) ) ) ) ) ) . )
(ROOT (S (VP (VB Learn) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB tell) (NP (DT the) (JJ invasive) (NNS exotics)) (PP (IN from) (NP (JJ other) (NNS species)))))))) (. .)))
Learn how to tell the invasive exotics from other 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))))))) (. .)))