( ( Purified water ) ( ( lacks ( ( ( minerals and ) ions ) ( such ( as ( calcium ( that ( ( ( ( ( play ( key roles ) ) ( in ( ( biological functions ) ( such ( as ( in ( nervous ( system homeostasis ) ) ) ) ) ) ) ) , ) and ) ( ( are normally ) ( found ( in ( potable water ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Purified) (NN water)) (VP (VBZ lacks) (NP (NP (NNS minerals) (CC and) (NNS ions)) (PP (JJ such) (IN as) (NP (NP (NN calcium)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP play) (NP (JJ key) (NNS roles)) (PP (IN in) (NP (NP (JJ biological) (NNS functions)) (PP (JJ such) (IN as) (PP (IN in) (NP (JJ nervous) (NN system) (NNS homeostasis))))))) (, ,) (CC and) (VP (VBP are) (ADVP (RB normally)) (VP (VBN found) (PP (IN in) (NP (JJ potable) (NN water)))))))))))) (. .)))
Purified water lacks minerals and ions such as calcium that play key roles in biological functions such as in nervous system homeostasis, and are normally found in potable water.
(ROOT (S (NP (DT The) (JJ nervous) (NN system)) (VP (VBZ plays) (NP (NP (DT a) (JJ critical) (NN role)) (PP (IN in) (NP (NP (DT the) (NN regulation)) (PP (IN of) (NP (NN vascular) (NNS homeostasis))))))) (. .)))