( ( Explain ( ( the significance ) ( of ( fossils ( in ( sedimentary rocks ) ) ) ) ) ) . )
(ROOT (S (VP (VB Explain) (NP (NP (DT the) (NN significance)) (PP (IN of) (NP (NP (NNS fossils)) (PP (IN in) (NP (JJ sedimentary) (NNS rocks))))))) (. .)))
Explain the significance of fossils in sedimentary rocks.
(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)))))))))) (. .)))