Each individual's survival curve, or the probability of surviving beyond a given age, should shift as a result of an environmental quality improvement.
( ( ( ( ( ( ( Each ( individual 's ) ) ( survival curve ) ) , ) or ) ( ( the probability ) ( of ( surviving ( beyond ( a ( given age ) ) ) ) ) ) ) , ) ( ( should ( shift ( as ( ( a result ) ( of ( an ( environmental ( quality improvement ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT Each) (NN individual) (POS 's)) (NN survival) (NN curve)) (, ,) (CC or) (NP (NP (DT the) (NN probability)) (PP (IN of) (S (VP (VBG surviving) (PP (IN beyond) (NP (DT a) (VBN given) (NN age))))))) (, ,)) (VP (MD should) (VP (VB shift) (PP (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (DT an) (JJ environmental) (NN quality) (NN improvement))))))) (. .)))
Environmental quality has no impact on the life expectancy of people who are already old.
( ( Environmental quality ) ( ( has ( ( no impact ) ( on ( ( the ( life expectancy ) ) ( of ( people ( who ( ( are already ) old ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Environmental) (NN quality)) (VP (VBZ has) (NP (NP (DT no) (NN impact)) (PP (IN on) (NP (NP (DT the) (NN life) (NN expectancy)) (PP (IN of) (NP (NP (NNS people)) (SBAR (WHNP (WP who)) (S (VP (VBP are) (ADVP (RB already)) (ADJP (JJ old))))))))))) (. .)))