( ( ( ( Some sharks ) and ) ( many ( ( skates and ) rays ) ) ) ( ( spend ( ( much time ) ( ( ( ( ( resting ( on ( the seafloor ) ) ) , ) ( using ( ( the muscles ) ( of ( their jaws ) ) ) ) ) and ) ( pharynx ( to ( ( pump water ) ( over ( the gills ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Some) (NNS sharks)) (CC and) (NP (JJ many) (NNS skates) (CC and) (NNS rays))) (VP (VBP spend) (S (NP (JJ much) (NN time)) (VP (VP (VBG resting) (PP (IN on) (NP (DT the) (NN seafloor)))) (, ,) (VP (VBG using) (NP (NP (DT the) (NNS muscles)) (PP (IN of) (NP (PRP$ their) (NNS jaws))))) (CC and) (VP (VBG pharynx) (S (VP (TO to) (VP (VB pump) (NP (NN water)) (PP (IN over) (NP (DT the) (NNS gills)))))))))) (. .)))
Some sharks and many skates and rays spend much time resting on the seafloor, using the muscles of their jaws and pharynx to pump water over the gills.
(ROOT (S (NP (NNP Jaws) (CC and) (NN pharynx) (NNS muscles)) (VP (VBP are) (VP (VBN used) (S (VP (TO to) (VP (VB pump) (NP (NN water)) (PP (IN over) (NP (DT the) (NNS gills)))))))) (. .)))