( Fossils ( ( are ( ( the remains ) ( of ( organisms ( that ( became ( ( ( trapped and ) preserved ) ( in ( ancient ( sedimentary rock ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Fossils)) (VP (VBP are) (NP (NP (DT the) (NNS remains)) (PP (IN of) (NP (NP (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (VBD became) (VP (VBN trapped) (CC and) (VBN preserved) (PP (IN in) (NP (JJ ancient) (JJ sedimentary) (NN rock))))))))))) (. .)))
Fossils are the remains of organisms that became trapped and preserved in ancient 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)))))))))) (. .)))