( They ( ( grow ( in ( ( fresh or ) ( salt water ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP grow) (PP (IN in) (NP (NP (JJ fresh)) (CC or) (NP (NN salt) (NN water))))) (. .)))
They grow in 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))))) (. .)))