( ( ( Urea and ) ( other wastes ) ) ( ( are ( ( carried ( in ( the bloodstream ) ) ) ( to ( ( ( the kidneys ) , ) ( where ( they ( are ( ( removed and ) ( form urine ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Urea)) (CC and) (NP (JJ other) (NNS wastes))) (VP (VBP are) (VP (VBN carried) (PP (IN in) (NP (DT the) (NN bloodstream))) (PP (TO to) (NP (NP (DT the) (NNS kidneys)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (PRP they)) (VP (VBP are) (VP (VP (VBN removed)) (CC and) (VP (NN form) (NP (NN urine))))))))))) (. .)))
Urea and other wastes are  carried in the bloodstream to the kidneys, where they are removed and  form urine.
(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)))))))) (. .)))