( ( Because ( amphibians ( ( live ( part ( of ( ( their lives ) ( in ( ( water and ) part ) ) ) ) ) ) ( on land ) ) ) ) ( , ( they ( ( are ( exposed ( to ( water ( , ( soil ( , ( and ( air pollutants ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Because) (S (NP (NNS amphibians)) (VP (VBP live) (NP (NP (NN part)) (PP (IN of) (NP (NP (PRP$ their) (NNS lives)) (PP (IN in) (NP (NN water) (CC and) (NN part)))))) (PP (IN on) (NP (NN land)))))) (, ,) (NP (PRP they)) (VP (VBP are) (VP (VBN exposed) (PP (TO to) (NP (NN water) (, ,) (NN soil) (, ,) (CC and) (NN air) (NNS pollutants))))) (. .)))
Because amphibians live part of their lives in water and part on land, they are exposed to water, soil, and air pollutants.
(ROOT (S (NP (NNS Frogs)) (VP (VBP are) (VP (VBG amphibians) (NP (NP (DT that) (JJ live) (NN part)) (PP (IN of) (NP (NP (NP (DT the) (NN time)) (PP (IN in) (NP (JJ fresh) (NN water)))) (CC and) (NP (NP (JJ live) (NN rest)) (PP (IN of) (NP (NP (DT the) (NN time)) (PP (IN on) (NP (NN land))))))))))) (. .)))