( Air ( ( ( ( enters ( the nares ) ) and ) ( is ( ( ( ( ( ( moistened and ) warmed ) ( as ( it ( travels ( through ( the ( nasal cavity ) ) ) ) ) ) ) ( -LRB- ( ( which ( connects ( with ( ( ( the ( infraorbital sinus ) ) and ) ( the ( cervicocephalic ( air sacs ) ) ) ) ) ) ) -RRB- ) ) ) and ) ( ( exits ( the ( nasal cavity ) ) ) ( through ( the ( choanal slit ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Air)) (VP (VP (VBZ enters) (NP (DT the) (NNS nares))) (CC and) (VP (VBZ is) (VP (VP (VBN moistened) (CC and) (VBN warmed) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ travels) (PP (IN through) (NP (DT the) (JJ nasal) (NN cavity))))))) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT which)) (S (VP (VBZ connects) (PP (IN with) (NP (NP (DT the) (JJ infraorbital) (NNS sinus)) (CC and) (NP (DT the) (JJ cervicocephalic) (NN air) (NNS sacs))))))) (-RRB- -RRB-)) (CC and) (VP (VBN exits) (NP (DT the) (JJ nasal) (NN cavity)) (PP (IN through) (NP (DT the) (JJ choanal) (NN slit))))))) (. .)))
Air enters the nares and is moistened and warmed as it travels through the nasal cavity (which connects with the infraorbital sinus and the cervicocephalic air sacs) and exits the nasal cavity through the choanal slit.
(ROOT (S (PP (IN In) (NP (NNS mammals))) (, ,) (NP (NN air)) (VP (VBZ is) (VP (VBN warmed) (CC and) (VBN humidified) (PP (IN in) (NP (DT the) (JJ nasal) (NN cavity))))) (. .)))