( ( ( The concentration ) ( of salts ) ) ( ( ( is also ) ( ( affected ( by ( condensation ( of water ) ) ) ) ( at ( low ( relative humidities ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN concentration)) (PP (IN of) (NP (NNS salts)))) (VP (VBZ is) (ADVP (RB also)) (VP (VBN affected) (PP (IN by) (NP (NP (NN condensation)) (PP (IN of) (NP (NN water))))) (PP (IN at) (NP (JJ low) (JJ relative) (NNS humidities))))) (. .)))
The concentration of salts is also affected by condensation of water at low relative humidities.
(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))))) (. .)))