( ( ( ( Gill slits ) ( All chordates ) ) ( -LRB- ( ( including humans ) -RRB- ) ) ) ( ( ( possess ( these features ) ) ( at ( ( some stage ) ( in ( ( their ontogeny ) ( -LRB- ( ( ( growth and ) development ) -RRB- ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Gill) (NNP slits)) (NP (DT All) (NNS chordates))) (PRN (-LRB- -LRB-) (PP (VBG including) (NP (NNS humans))) (-RRB- -RRB-))) (VP (VBP possess) (NP (DT these) (NNS features)) (PP (IN at) (NP (NP (DT some) (NN stage)) (PP (IN in) (NP (NP (PRP$ their) (NN ontogeny)) (PRN (-LRB- -LRB-) (NP (NP (NN growth)) (CC and) (NP (NN development))) (-RRB- -RRB-))))))) (. .)))
Gill slits All chordates (including humans) possess these features at some stage in their ontogeny (growth and development).
(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))))))) (. .)))