( ( The kidneys ) ( ( ( ( ( ( ( remove ( liquid waste ) ) ( from ( ( the blood ) ( in ( ( the form ) ( of urine ) ) ) ) ) ) , ) ( keep ( ( a ( stable balance ) ) ( of ( salts ( in ( the blood ) ) ) ) ) ) ) and ) ( produce ( ( a hormone ) ( that ( aids ( ( the formation ) ( of ( red ( blood cells ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS kidneys)) (VP (VP (VB remove) (NP (JJ liquid) (NN waste)) (PP (IN from) (NP (NP (DT the) (NN blood)) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NN urine)))))))) (, ,) (VP (VB keep) (NP (NP (DT a) (JJ stable) (NN balance)) (PP (IN of) (NP (NP (NNS salts)) (PP (IN in) (NP (DT the) (NN blood))))))) (CC and) (VP (VB produce) (NP (NP (DT a) (NN hormone)) (SBAR (WHNP (WDT that)) (S (VP (VBZ aids) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (JJ red) (NN blood) (NNS cells)))))))))) (. .)))
The kidneys remove liquid waste from the blood in the form of urine, keep a stable balance of salts in the blood and produce a hormone that aids the formation of red blood cells.
(ROOT (S (NP (NNP Urine)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (JJ liquid) (NN waste)) (VP (VBN formed) (PP (IN by) (NP (NNS kidneys)))))))) (. .)))