( ( ( The idea ) ( of ( chimpanzee culture ) ) ) ( ( ( ( is controversial ) , ) ( since ( ( some experts ) ( ( define culture ) ( as ( a ( ( distinctly human ) trait ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN idea)) (PP (IN of) (NP (JJ chimpanzee) (NN culture)))) (VP (VBZ is) (ADJP (JJ controversial)) (, ,) (SBAR (IN since) (S (NP (DT some) (NNS experts)) (VP (VB define) (NP (NN culture)) (PP (IN as) (NP (DT a) (ADJP (RB distinctly) (JJ human)) (NN trait))))))) (. .)))
The idea of chimpanzee culture is controversial, since some experts define culture as a distinctly human trait.
(ROOT (S (NP (JJ Adult) (NNS humans)) (VP (VBP lack) (NP (NP (DT some)) (PP (IN of) (NP (NP (DT the) (VBG defining) (NNS traits)) (PP (IN of) (NP (NNS chordates))))))) (. .)))