( Why ( ( ( do we ) ( ( find ( ( ( few or ) no ) ( human fossils ) ) ) ( in ( ( most sedimentary ) rock ) ) ) ) ? ) )
(ROOT (SBARQ (WHADVP (WRB Why)) (SQ (VBP do) (NP (PRP we)) (VP (VB find) (NP (ADJP (JJ few) (CC or) (DT no)) (JJ human) (NNS fossils)) (PP (IN in) (NP (ADJP (RBS most) (JJ sedimentary)) (NN rock))))) (. ?)))
Why do we find few or no human fossils in most sedimentary rock?
(ROOT (S (NP (JJS Most) (NNS fossils)) (VP (VBP are) (VP (VBN found) (PP (IN in) (NP (JJ sedimentary) (NNS rocks))) (SBAR (IN because) (S (NP (NNS organisms)) (VP (MD can) (VP (VB be) (VP (VBN preserved) (PP (IN in) (NP (JJ sedimentary) (NN rock)))))))))) (. .)))