( ( Salt ( and ( Fresh Water ) ) ) - )
(ROOT (NP (NP (NNP Salt) (CC and) (NNP Fresh) (NNP Water)) (: -)))
Salt and Fresh Water -
(ROOT (S (NP (JJ Fresh) (NN water) (NNS biomes)) (VP (VBP are) (VP (VBN defined) (PP (IN by) (NP (JJ low) (NN salt) (NN concentration))))) (. .)))