( ( freshwater ( ( A ( ( noun or ) adjective ) ) ( that ( ( describes ( bodies ( of water ) ) ) ( with ( ( ( very low ) concentrations ) ( of salt ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB freshwater) (NP (NP (DT A) (NN noun) (CC or) (NN adjective)) (SBAR (WHNP (WDT that)) (S (VP (VBZ describes) (NP (NP (NNS bodies)) (PP (IN of) (NP (NN water)))) (PP (IN with) (NP (NP (ADJP (RB very) (JJ low)) (NNS concentrations)) (PP (IN of) (NP (NN salt)))))))))) (. .)))
freshwater    A noun or adjective that describes bodies of water with very low concentrations of salt.
(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))))) (. .)))