( ( ( Fresh or ) Salt ) ( Water . ) )
(ROOT (S (NP (NNP Fresh) (CC or) (NNP Salt)) (VP (VBZ Water)) (. .)))
Fresh or Salt 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))))) (. .)))