( ( -LRB- ( 6-8 -RRB- ) ) ( ( Knows ( that ( fossils ( provide ( ( important evidence ) ( of ( how ( ( ( life and ) ( environmental conditions ) ) ( have ( changed ( on ( ( the Earth ) ( over ( time ( -LRB- ( ( ( ( ( ( ( e.g. , ) ( changes ( in ( atmospheric composition ) ) ) ) , ) ( movement ( of ( lithospheric plates ) ) ) ) , ) ( impact ( of ( an ( ( asteroid or ) comet ) ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (-LRB- -LRB-) (NNP 6-8) (-RRB- -RRB-)) (VP (VBZ Knows) (SBAR (IN that) (S (NP (NNS fossils)) (VP (VBP provide) (NP (NP (JJ important) (NN evidence)) (PP (IN of) (SBAR (WHADVP (WRB how)) (S (NP (NP (NN life)) (CC and) (NP (JJ environmental) (NNS conditions))) (VP (VBP have) (VP (VBN changed) (PP (IN on) (NP (NP (DT the) (NN Earth)) (PP (IN over) (NP (NP (NN time)) (PRN (-LRB- -LRB-) (NP (NP (NP (NNP e.g.)) (, ,) (NP (NP (NNS changes)) (PP (IN in) (NP (JJ atmospheric) (NN composition))))) (, ,) (NP (NP (NN movement)) (PP (IN of) (NP (JJ lithospheric) (NNS plates)))) (, ,) (NP (NP (NN impact)) (PP (IN of) (NP (DT an) (NN asteroid) (CC or) (NN comet))))) (-RRB- -RRB-)))))))))))))))) (. .)))
(6-8) Knows that fossils provide important evidence of how life and environmental conditions have changed on the Earth over time (e.g., changes in atmospheric composition, movement of lithospheric plates, impact of an asteroid or comet).
(ROOT (S (SBAR (WHADVP (WRB How)) (S (NP (NN ice) (NNS cores)) (VP (VBP are) (ADJP (JJ important) (PP (TO to) (NP (NP (DT the) (NN study)) (PP (IN of) (NP (JJ geologic) (NN history))))))))) (VP (VBZ is) (ADVP (RBS best)) (VP (VBN described) (SBAR (IN as) (S (NP (PRP they)) (VP (VBP contain) (NP (NN evidence) (NN showing) (NNS changes)) (PP (IN in) (NP (NP (DT the) (JJ atmospheric) (NN composition)) (PP (IN over) (NP (NN time)))))))))) (. .)))