( ( ( The role ) ( of ( ( ( ( bird kidneys ) ( -LRB- ( ( Figure 1 ) -RRB- ) ) ) , ) ( like ( ( the kidneys ) ( of ( other vertebrates ) ) ) ) ) ) ) ( ( is ( ( ( ( ( filtration , ) ( ( excretion or ) secretion ) ) , ) and ) absorption ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN role)) (PP (IN of) (NP (NP (NN bird) (NNS kidneys)) (PRN (-LRB- -LRB-) (NP (NN Figure) (CD 1)) (-RRB- -RRB-)) (, ,) (PP (IN like) (NP (NP (DT the) (NNS kidneys)) (PP (IN of) (NP (JJ other) (NNS vertebrates)))))))) (VP (VBZ is) (NP (NP (NN filtration)) (, ,) (NP (NN excretion) (CC or) (NN secretion)) (, ,) (CC and) (NP (NN absorption)))) (. .)))
The role of bird kidneys (Figure 1), like the kidneys of other vertebrates is filtration, excretion or secretion, and absorption.
(ROOT (S (NP (NP (DT The) (JJ main) (NNS functions)) (PP (IN of) (NP (NN epithelia)))) (VP (VBP are) (NP (NP (NN protection)) (PP (IN from) (NP (NP (DT the) (NN environment) (, ,) (NN coverage) (, ,) (NN secretion) (CC and) (NN excretion)) (, ,) (NP (NN absorption)) (, ,) (CC and) (NP (NN filtration)))))) (. .)))