( ( The kidneys ) ( ( ( ( ( ( ( remove ( from ( ( the ( blood ( liquid waste ) ) ) ( in ( ( the form ) ( of urine ) ) ) ) ) ) , ) ( ( keep ( ( a ( stable balance ) ) ( of ( ( salts and ) ( other substances ) ) ) ) ) ( 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) (PP (IN from) (NP (NP (DT the) (NN blood) (NN liquid) (NN waste)) (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)) (CC and) (NP (JJ other) (NNS substances))))) (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 from the blood liquid waste in the form of urine, keep a stable balance of salts and other substances 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)))))))) (. .)))