( and ( ( respiratory ( ( rate , ) ( ( 20 breaths ) ( per minute ) ) ) ) . ) )
(ROOT (S (CC and) (VP (VB respiratory) (NP (NP (NN rate)) (, ,) (NP (NP (CD 20) (NNS breaths)) (PP (IN per) (NP (NN minute)))))) (. .)))
and respiratory rate, 20 breaths per minute.
(ROOT (S (NP (NP (DT The) (JJ normal) (NN respiratory) (NN rate)) (PP (IN per) (NP (NP (NN minute)) (PP (IN in) (NP (JJ adult) (NNS humans)))))) (VP (VBZ is) (NP (CD 12-18) (NNS breaths))) (. .)))