( ( ( Observe ( the pharynx ) ) ( with ( ( gill slits ) ( separated ( by ( gill bars ) ) ) ) ) ) . )
(ROOT (S (VP (VB Observe) (NP (DT the) (NN pharynx)) (PP (IN with) (NP (NP (JJ gill) (NNS slits)) (VP (VBN separated) (PP (IN by) (NP (JJ gill) (NNS bars))))))) (. .)))
Observe the pharynx with gill slits separated by gill bars .
(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)))))))) (. .)))