( ( First ( the ( bodies ( immune system ) ) ) ) ( ( is ( weakened ( through ( various ( solvents ( , ( ( chemicals and ) metals ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (RB First) (DT the) (JJ bodies) (JJ immune) (NN system)) (VP (VBZ is) (VP (VBN weakened) (PP (IN through) (NP (JJ various) (NNS solvents) (, ,) (NNS chemicals) (CC and) (NNS metals))))) (. .)))
First the bodies immune system is weakened through various solvents, chemicals and metals.
(ROOT (S (NP (DT The) (JJ innate) (JJ immune) (NN system)) (VP (VBZ serves) (PP (IN as) (NP (NP (DT a) (JJ first) (NN responder)) (PP (TO to) (NP (NP (JJ pathogenic) (NNS threats)) (SBAR (WHNP (WDT that)) (S (VP (VB bypass) (NP (NP (JJ natural) (ADJP (NN physical) (CC and) (NN chemical)) (NNS barriers)) (PP (IN of) (NP (DT the) (NN body)))))))))))) (. .)))