( ( Excretory systems ) ( ( ( regulate ( ( the ( chemical composition ) ) ( of ( body fluids ) ) ) ) ( by ( ( ( removing ( metabolic wastes ) ) and ) ( retaining ( ( the ( proper amounts ) ) ( of ( ( ( ( ( water , ) salts ) , ) and ) nutrients ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Excretory) (NNS systems)) (VP (VB regulate) (NP (NP (DT the) (JJ chemical) (NN composition)) (PP (IN of) (NP (NN body) (NNS fluids)))) (PP (IN by) (S (VP (VP (VBG removing) (NP (JJ metabolic) (NNS wastes))) (CC and) (VP (VBG retaining) (NP (NP (DT the) (JJ proper) (NNS amounts)) (PP (IN of) (NP (NP (NN water)) (, ,) (NP (NNS salts)) (, ,) (CC and) (NP (NNS nutrients)))))))))) (. .)))
Excretory systems regulate the chemical composition of body fluids by removing metabolic wastes and retaining the proper amounts of water, salts, and nutrients.
(ROOT (S (NP (DT The) (JJ urinary) (NN system) (NN system)) (VP (VP (VBZ controls) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN water)))) (PP (IN in) (NP (DT the) (NN body)))) (CC and) (VP (VBZ removes) (NP (NNS wastes)))) (. .)))